Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	3,421
516	HEAVY EQUIPMENT MECHANICS	216
518	INDUSTRIAL MACHINERY REPAIRERS	292
523	ELECTRONIC REPAIRERS, COMMUNICATIONS AND INDUSTRIAL EQUIPMENT	107
533	MISCELLANEOUS ELECTRICAL AND ELECTRONIC EQUIPMENT REPAIRERS	22
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	516
549	NOT SPECIFIED MECHANICS AND REPAIRERS	3,508
575	ELECTRICIANS	226
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	6,992
597	STRUCTURAL METAL WORKERS	939
617	MINING OCCUPATIONS, N.E.C.	12,738
633	SUPERVISORS, PRODUCTION OCCUPATIONS	516
637	MACHINISTS	100
646	LAY-OUT WORKERS	60
653	SHEET METAL WORKERS	618
684	MISCELLANEOUS PRECISION WORKERS, N.E.C.	60
696	STATIONARY ENGINEERS	539
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	69
769	SLICING AND CUTTING MACHINE OPERATORS	775
779	MACHINE OPERATORS, NOT SPECIFIED	404
783	WELDERS AND CUTTERS	15,690
785	ASSEMBLERS	4,416
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	341
804	TRUCK DRIVERS, HEAVY	1,053
889	LABORERS, EXCEPT CONSTRUCTION	60
TOTAL		53,676

*(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.