Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
019	MANAGERS AND ADMINISTRATORS, N.E.C.	460
335	FILE CLERKS	82
453	JANITORS AND CLEANERS	1,341
505	AUTOMOBILE MECHANICS	93
514	AUTOMOBILE BODY AND RELATED REPAIRERS	22
519	MACHINERY MAINTENANCE OCCUPATIONS	22
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	1,042
575	ELECTRICIANS	65
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	2,876
587	PLUMBER, PIPEFITTER, AND STEAMFITTER APPRENTICES	460
599	CONSTRUCTION TRADES, N.E.C.	671
653	SHEET METAL WORKERS	1,986
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	51
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	2
783	WELDERS AND CUTTERS	4,443	81
785	ASSEMBLERS	1,740	17
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	687
TOTAL		16,045	98

*(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.