“Investment casting operation” means a ceramic or metal casting process that is used to make reproductions of sculptured pieces and is adapted for the manufacture of precision metal parts using the lost wax process.

Source. #1717, eff 2-19-81; ss by #2332, eff 4-29-83; ss by #2938, eff 12-27-84; ss and moved by #5033, eff 12-27-90 (see Env-A 101.53) New. #5033, eff 12-27-90 (from Env-A 101.51); ss and moved by #6057-A, eff 6-30-95 (from Env-A 101.52); ss by #6428-A, eff 1-18-97; renumbered by #8256 (from Env-A 101.155), (see Revision Note #1 at chapter heading); renumbered by #8304 (see Revision Note #2 at chapter heading); renumbered by #9839 (from Env-A 101.104), (see Revision Note #3 at chapter heading); ss by #13105, eff 9-25-20 (formerly Env-A 101.106) (see Revision Note #4 at chapter heading for Env-A 100)