Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
073	CHEMISTS, EXCEPT BIOCHEMISTS	149	75
449	MAIDS AND HOUSEMEN	309
453	JANITORS AND CLEANERS	5,421	936
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	1,279
518	INDUSTRIAL MACHINERY REPAIRERS	1,172
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	1,750
549	NOT SPECIFIED MECHANICS AND REPAIRERS	1,242	39
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	58
597	STRUCTURAL METAL WORKERS	324
633	SUPERVISORS, PRODUCTION OCCUPATIONS	243
634	TOOL AND DIE MAKERS	273
637	MACHINISTS	3,768	188
684	MISCELLANEOUS PRECISION WORKERS, N.E.C.	788
704	LATHE AND TURNING MACHINE OPERATORS	1,033
705	MILLING AND PLANING MACHINE OPERATORS	139	11
706	PUNCHING AND STAMPING PRESS MACHINE OPERATORS	259
708	DRILLING AND BORING MACHINE OPERATORS	437
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	4
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	209	12
779	MACHINE OPERATORS, NOT SPECIFIED	2,115	700
783	WELDERS AND CUTTERS	1,294
785	ASSEMBLERS	386	108
844	OPERATING ENGINEERS	531
869	CONSTRUCTION LABORERS	33
TOTAL		23,214	2,068

*(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.