17 C.F.R. § 270.18f-1
(a) A registered open-end investment company which has the right to redeem securities of which it is the issuer in assets other than cash may file with the Commission at any time a notification of election on Form N-18F-1 (§ 274.51 of this chapter) committing itself to pay in cash all requests for redemption by any shareholder of record, limited in amount with respect to each shareholder during any 90-day period to the lesser of
(b) An election pursuant to paragraph (a) of this section:
(c) Upon making the election described in paragraph (a) of this section, an investment company shall be exempt from the requirements of section 18(f)(1) (of the Act) to the extent necessary for such company to effectuate redemptions in the manner set forth in such paragraph.
(Secs. 7, 10, and 19 of the Securities Act of 1933 (15 U.S.C. 77g, 77j, and 77s) and secs. 8, 30 and 38 of the Investment Company Act of 1940 (15 U.S.C. 80a-8, 80a-29 and 80a-37))
[36 FR 11919, June 23, 1971, as amended at 48 FR 37940, Aug. 22, 1983]