Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
073	CHEMISTS, EXCEPT BIOCHEMISTS	181	8
216	ENGINEERING TECHNICIANS, N.E.C.	140	47
224	CHEMICAL TECHNICIANS	1,170	239
385	DATA-ENTRY KEYERS	166
453	JANITORS AND CLEANERS	1,996
518	INDUSTRIAL MACHINERY REPAIRERS	852
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	795
563	BRICKMASONS AND STONEMASONS	123
575	ELECTRICIANS	82
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	144	12
633	SUPERVISORS, PRODUCTION OCCUPATIONS	171
634	TOOL AND DIE MAKERS	320
637	MACHINISTS	35
696	STATIONARY ENGINEERS	82
763	ROASTING AND BAKING MACHINE OPERATORS, FOOD	864	29
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	142
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	88
779	MACHINE OPERATORS, NOT SPECIFIED	1,125
783	WELDERS AND CUTTERS	45
804	TRUCK DRIVERS, HEAVY	994
865	HELPERS, CONSTRUCTION TRADES	288
889	LABORERS, EXCEPT CONSTRUCTION	263
TOTAL		10,067	335

*(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.