Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	491
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	595
535	CAMERA, WATCH, AND MUSICAL INSTRUMENT REPAIRERS	3,476
549	NOT SPECIFIED MECHANICS AND REPAIRERS	521
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	437	17
637	MACHINISTS	1,298
643	BOILERMAKERS	34	6
653	SHEET METAL WORKERS	361	43
717	FABRICATING MACHINE OPERATORS, N.E.C.	199	57
756	MIXING AND BLENDING MACHINE OPERATORS	24
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	238	71
783	WELDERS AND CUTTERS	8,292	144
785	ASSEMBLERS	2,594	96
887	VEHICLE WASHERS AND EQUIPMENT CLEANERS	905
889	LABORERS, EXCEPT CONSTRUCTION	430	43
TOTAL		19,896	476

*(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.