After unsuccessfully prosecuting a personal injury suit, plaintiff-appellant Darryl W. Elliott invites us to set aside a jury verdict in favor of the defendant S.D. Warren Company (Warren) and to reverse a summary judgment in favor of two other defendants (whom we sometimes shall refer to collectively as “Rust”). 1 Discerning no error, we decline both invitations.
I. BACKGROUND
Warren hired Rust to design, build, and manage the erection of an addition to its paper mill in Hinckley, Maine. That firm in turn subcontracted with its wholly-owned subsidiary, Allegheny Industrial Electrical, Inc. (Allegheny), to install electrical conduit. Elliоtt, an Allegheny employee, severely injured his left wrist while working at the job site on July 21, 1990. The injury occurred when Elliott caught his hand between a railing and an adjacent piece of electrical conduit on a stairway in a structure under construction. On Elliott’s theory of the case, a lack of adequate clearance at the pinchpoint between the railing and the conduit caused him to catch his hand, pull back, fall, and injure himself.
The appellant collected workers’ cоmpensation benefits from his employer. Several years later, he settled his workers’ compensation claim and brought a third-party tort suit against Warren and Rust in a Maine state court. In his complaint, he alleged that Warren, as the owner of the premises and the organization having control over the area where the accident occurred, had failed both to maintain a safe workplace and to warn of a dangerous condition. At the same time, he accused Rust оf negligently installing the stairway and conduit. Invoking diversity jurisdiction — the appellant is a citizen and resident of New York, Warren is a Pennsylvania corporation that maintains its principal place of business in Massachusetts, and Rust is chartered in Delaware and headquartered in Alabama — the defendants removed the case to Maine’s federal district court. See 28 U.S.C. §§ 1332(a), 1441(a).
*4 In due season, the district court granted summary judgment in favor of Rust, see Fed.R.Civ.P. 56(c), holding that Rust was insulated from liability by the terms of the release that the appellant executed when he settled his workers’ compensation claim. The lawsuit proceeded to trial against Warren and the jury returned a verdict for the defendant. This appeal ensued.
II. THE JURY VERDICT
We first consider the appeal insofar as it pertains to the take-nothing jury verdict.
A. Negligence Per Se.
The appellant’s most substantial claim of error concerns the district court’s instruction to the jury in regard to evidence which indicated that, at the spot where Elliott caught his hand, the distance between thе railing and the electrical conduit was three-quarters of an inch, rather than the three inches required by a federal regulation promulgated by the Occupational Safety and Health Administration (OSHA).
See
29 C.F.R. § 1910.23(e)(6) (1990) (stipulating that “[a]ll handrails and railings shall be provided with a clearance of not less than 3 inches between the handrail or railing and any other object”). Citing
Pratico v. Portland Terminal Co.,
Pratico
involved a cause of action that arose under the Federal Employers’ Liability Act (FELA), 45 U.S.C. §§ 51-60. In that context, we held that the violation of a regulation validly promulgated by OSHA under the Occupational Safety and Health Act (OSH Act), 29 U.S.C. §§ 651-678, could be deemed negligence per se.
At the time this court decided
Pratico,
we had very little guidance from our sister circuits.
See id.
at 264 (identifying the Fifth Circuit as “the only circuit court to have addressed this issue”) (citing,
inter alia, Rabon v. Automatic Fasteners, Inc.,
We need not pursue the status of Pratico today. For present purposes, it suffices to note that Pratico involved an FELA claim and the case’s holding is properly limited to causes of action brought under that statute. The case at bar does not involve a cause of *5 action arising under federal law, but, rather, a cause of action arising under Maine’s common law. This is a dispositive difference.
In
Pedraza, v. Shell Oil Co.,
To cinch matters, in a diversity action a federal court is constrained to apply state substantive law,
see Coyne v. Taber Partners I,
B. Other Jury Instructions.
The appellant next asserts that the district court erred in two related instances by refusing to incorporate specific language into its jury instructions. The appellant requested that, on the issue of Warren’s control over the construction site, the judge (1) recount for the jury a detailed twelve-point checklist itemizing those elements that he contended various courts around the country have found to support a finding of control; and (2) tell the jury that, if it concluded that Warren had retained control over the job site, then Warren had a “nondelegable” duty to furnish Allegheny’s employees with a safe and suitablе workplace. The district court declined to give either instruction in haec verba, but instead advised the jury:
A contract between an owner and an independent contractor allocating responsibility between themselves for maintaining safe premises ... does not reheve the owner of liability to invitees for injuries sustained as a result of any dangerous conditions known or discoverable by the owner of the property.
The defendant in this ease contracted with Rust Engineering to construct its No. 3 paper machine building. This fаct does not absolve the defendant for injuries sustained by its invitees on its premises while the construction project was in progress if the defendant retained control of any part of the work. One who entrusts work to a contractor, but retains control of any part of the work, is subject to liability for physical harm to others that is caused by his failure or its failure to exercise control with reasonable care. If you find that the defendant retained control of the construction site, thеn it is the duty of the defendant to furnish the employees of plaintiffs employer with a safe and suitable site.
We reject the appellant’s claims of error on both procedural and substantive grounds. From a procedural standpoint, the appellant did not object in the prescribed manner and at the appointed time either to the district court’s refusal to give his requested instructions or to the charge actually given.
See
Fed.R.Civ.P. 51.
3
Although he did make a general reference to “what we disсussed earlier today” — presumably referring to a chambers conference — when the district court called counsel to sidebar near
*6
the end of the charge, we have held with eeholalie regularity that strict compliance with Rule 51 is mandatory and that a failure of compliance will not be excused merely because the defaulting party brought the same matter to the trial judge’s attention more specifically at some other time.
See, e.g., Poulin v. Greer,
To be sure, even a forfeited error is amenable to plain-error review.
See Wells Real Estate, Inc. v. Greater Lowell Bd. of Realtors,
The trial court’s refusal to give a particular instruction constitutes reversible error only if the requested instruction was (1) correct as a matter of substantive law, (2) not substantially incorporated into the charge as rendered, and (3) integral to an important point in the case.
United States v. DeStefano,
The appellant easily satisfies the third prong of this test. After all, the intertwined issues of Warren’s control over the premises and the duty it owed to Elliott while he was working at the construction site are integral to the appellant’s theory of the сase.
See Hanson v. Madison Paper Co.,
A trial court is obliged to inform the jury about the applicable law, but, within wide limits, the method and manner in which the judge carries out this obligation is left to his or her discretion. Consequently, though both sides have a perfect right — indeed, a duty^ — to advise the judge what type of instructions they believe are fitting, neither is entitled to dictate the turn of phrase the judge should use to acquaint lay jurors with the applicable law.
See United States v. McGill,
When, as now, a disappointed suitor asks an appellate court to scrutinize a trial judge’s word choices, “the central inquiry reduces to whether, taking the charge as a whole, the instructions adequately illuminate the law applicable to the controlling issues in the case without unduly complicating matters or misleading the jury.”
DeStefano,
*7
Of course, a trial judge’s discretion in framing the issues for the jury is not unbridled, and an arbitrary refusal to amplify a hard-to-grasp concept might well invite reproof. Here, however, the district court had plausible reasons for refusing to augment its instructions. For example, Judge Brody saw the proffered checklist as a source of potential confusion and thus determined that, rather than run this risk, it would be preferable to present a more general statement of the law. This sort of judgment call is uniquely within the trial judge’s discretion, and we are reluctant to second-guess it. Similarly, Judge Brody eschewed the term “nondelegable” because he reasonably feared such an allusion might mislead jurors into thinking that strict liability applied or that Warren was liable vicariously for the independent negligence of Allegheny. This decision, too, was well within the realm of his discretion.
See Kelliher,
The appellant makes a last-ditch argument that the jurors’ submission of a mid-deliberation question proved the need for additional clarification on the nondelegability of Warren’s duty.
5
We do not agree. The judge’s original instructions accurately envisioned that the jury would wrestle with the issue of Warren’s independent duty of care to invitees on its premises during the currency of the construction project. Rather than elaborate on these initial, entirely correct instructions (which, along with the rest of the charge, had been typed and furnished for use in the jury room during deliberations), Judge Brody elected to refer the jury to the original formulation. As a general rule, the necessity for giving a supplementary instruction to the jury is a matter within the sound discretion of the trial court.
See United States v. Castenada,
We have said enough on this score. The challenged instructions accurately stated the law, sufficiently informed the jury of the appellant’s theory of the case, and worked no unfair prejudice to either party. As long as a jury charge satisfies these criteria, “the court’s choice of lаnguage is largely a matter of discretion.”
DeStefano,
C. Reference to Insurance.
Prior to trial, Warren, citing Fed.R.Evid. 403 (generally permitting the exclusion of evidence on the ground of undue prejudice) and Fed.R.Evid. 411 (specifically permitting the exclusion of evidence of liability insurance in certain circumstances), moved in li-mine to exclude any mention of indemnification or liability insurance. The motion referred to the indemnification and insurance provisions contained in the construction contract between Warren and Rust. The district court granted the motion provisionally, subject to the appellant’s right to revisit the issue during the trial.
In his case in chief, the appellant offered the construction contract into evidence. Everyone realized that the contract constituted relevant evidence because it contained provisions setting forth on-site responsibilities for construction and safety. The court admitted it, without redaction, as a full exhibit. Both parties made use of the contract during their examination of witnesses, especially in refer *8 ence to whether Warren had retained control over the construction site. The appellant, however, did not ask the court to reconsider its order in limine, and neither party mentioned the indemnification and liability insurance clauses before the jury.
At the close of all the evidence, the appellant seized upon the fact that everyone apparently had overlooked the need for redaction. His cоunsel requested leave of court to comment in summation on the unredaeted indemnification and insurance provisions. The court denied the request. The appellant assigns error, maintaining that the comments should have been allowed because the entire contract, including those provisions, was in evidence. We conclude that, in the peculiar circumstances of this case, the district court acted within its authority in limiting the use to which the contract could be put.
The touchstone of our analysis is Fed.R.Evid. 105, which states in pertinent part:
When evidence which is admissible as to one party or for one purpose but not admissible as to another party or for another purpose is admitted, the court, upon request, shall restrict the evidence to its proper scope and instruct the jury accordingly.
Fed.R.Evid. 105. This rule “provides the trial court with substantial control over both the admissibility of evidence and of limitations on its use.” 1 Jack B. Weinstein & Margaret A. Berger, Weinstein’s Federal Evidence § 105.02[1], at 105-6 (Joseph M. McLaughlin ed., 2d ed.1997). Althоugh it would have been better practice for the district court to have redacted the indemnification and insurance provisions when it accepted the contract as a full exhibit, the record leaves little room to doubt that the parties understood that the admission of the exhibit did not signify a withdrawal or relaxation of the court’s earlier in limine ruling. The appellant’s claim that defense counsel waived the in limine ruling by failing to object to the introduction of the unredacted contract into evidence appears to be wishful thinking. At any rate, an affirmative waiver typically involves the purposeful - relinquishment of a known right, and the self-serving claim that Warren intended to relinquish the benefit of the in limine ruling is without support in the record.
We will not paint the lily. The parties understood that indemnification and insurance evidence had been banned, and the appellant does not now contest the validity of that prohibition. Taking that as a given, the trial court acted apprоpriately in refusing to allow the appellant to undercut the in limine ruling by taking advantage of a momentary lapse.
III. THE SUMMARY JUDGMENT
The final component in the appellant’s as-severational array is his claim that the district court improperly granted summary judgment in favor of Rust. Some additional facts are needed to put this claim into perspective.
At the time Warren decided to build the paper mill addition, it contracted with Rust Engineering Company, a wholly-owned subsidiary of Rust International Corporation. Rust Engineering then subcontracted the electrical work to its wholly-owned subsidiary, Allegheny. To complicate matters further, in March of 1995 — well after the accident but prior to the institution of the third-party suit — Rust International Corporation changed its name to Rust Engineering and Construction, Inc. At about the same time the beneficial ownership of Rust Engineering Company apparently changed, and that company is now known as TRECO Construction Services, Inc.
On July 11, 1996, the appellant settled his workers’ comрensation claim against Allegheny, surrendering all future benefits in exchange for a lump sum payment of $215,000. As consideration for that stipend, the appellant executed a release in which he agreed to:
[R]emise, release and forever discharge Rust Engineering, the Employer and American Fidelity/MGA, the Insurance Carrier, plus their subsidiaries, successors, and related companies, present and former officers, agents, employees and attorneys (hereinafter referred to аs ‘Releasees’), of and from any and all actions, claims and *9 damages, including, but not limited to, claims to permanent impairment, compensation, rehabilitation, attorneys’ fees, medical and other expenses, ... or any other action, of any kind, in law or equity, which Releasor now has or ever had against the Releasees arising out of or related in any way to the Releasor’s employment at Rust Engineering, or to the claimed work-related injury of 7/21/90....
In their motion for brevis disposition, the Rust defendants argued that this release insulated them from tort liability for the appellant’s work-related injuries. The district court agreed, finding the release’s language to be clear, unambiguous, and entirely dispositive. Accordingly, the court granted summary judgment.
We review an order granting summary judgment de novo, reading the record “in the light most congenial to the nonmovant and resolving all reasonable inferences in that party’s favor.”
Hachikian v. FDIC,
The crux of the appellant’s argument involves the interpretation of the release. We have recognized that summary judgment is an appropriate vehicle for resolving contract-interpretation disputes when the contract language is not infected by some material ambiguity.
See Newport Plaza
Assocs.
v. Durfee Attleboro Bank (In re Newport Plaza
Assocs.),
The question whether a contract term is ambiguous is one of law for the judge.
See, e.g., Allen v. Adage, Inc.,
It is black-letter law that the meaning of an unambiguous writing must be derived exclusively from within its four corners.
See Portland Valve, Inc. v. Rockwood Systems Corp.,
The appellant’s fallback position is no more tenable. He suggests that the third-person plural possessive “their” (as in “their subsidiaries, successors, and related companies”) refers solely to the singular “American Fidelity/MGA.” This suggestion not only comes perilously close to the outer boundaries of acceptable legal argumentation, but also offends abecedarian rules of grammar. We reject the suggestion out of hand.
See Chadwick-BaRoss, Inc. v. T. Buck Constr., Inc.,
We need go no further. It is the proper office of an appellate court to affirm the entry of summary judgment when the words of a contract are so clear that “reasonable people could not differ over their meaning.”
Boston Five Cents Sav. Bank v. Secretary of Dep’t of HUD,
Affirmed. Costs to appellees.
Notes
. The plaintiff labelled these defendants "Rust Engineering and Construction, Inc.” and “Rust International Corporation.” The identities and interrelationship of the various Rust-related entities bear tangentially on the propriety of the order granting summary judgment. We discuss that facet of the matter in Part III, infra.
. The OSH Act provides in relevant part:
Nothing in this chapter shall be construed to supersede or in any manner affect any workmen’s compensation law or to enlarge or diminish or affect in any other manner the common law or statutory rights, duties, or liabilities of employers and employees under any law with respect to injuries, diseases, or death of employees arising out of, or in the course of, employment.
29 U.S.C. § 653(b)(4).
. Rule 51 provides in pertinent part:
No party may assign as error the giving or the failure to give an instruction unless that party objects thereto before the jury retires to consider its verdict, stating distinctly the matter objected to and the grounds of the objection.
. Without belaboring the point, we note that it is problematic whether Maine law incorporates all twelve of the points contained in the appellant's proposed multi-part instruction.
. The question read:
If we feel that Allegheny is negligent and S.D. Warren is in control, would the negligence carry over to S.D. Warren?
