Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
225	SCIENCE TECHNICIANS, N.E.C.	1,185	474
453	JANITORS AND CLEANERS	715	35
558	SUPERVISORS, N.E.C.	3,565
565	TILE SETTERS, HARD AND SOFT	2,217
633	SUPERVISORS, PRODUCTION OCCUPATIONS	1,185
634	TOOL AND DIE MAKERS	129
637	MACHINISTS	2,186
639	MACHINIST APPRENTICES	643
675	HAND MOLDERS AND SHAPERS, EXCEPT JEWELERS	733	147
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	422
725	MISCELLANEOUS METAL AND PLASTIC PROCESSING MACHINE OPERATORS	880
727	SAWING MACHINE OPERATORS	367
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	118
783	WELDERS AND CUTTERS	257
785	ASSEMBLERS	1,616
889	LABORERS, EXCEPT CONSTRUCTION	3,791
TOTAL		20,008	656

*(1) The estimates for each occupation apply across the surveyed industries in which the agent was observed. Not all industries were surveyed, and not all agents were observed in all surveyed industries. (2) When using the estimates, standard errors associated with estimates should be considered. (3) Potential exposures to a chemical agent are categorized as actual (i.e., the surveyor observed the use of the specific agent) or tradename (i.e., the surveyor observed the use of a tradename product known to contain the specific agent). The estimates presented in the table combine both categories.