Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	19,723	87
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	595
516	HEAVY EQUIPMENT MECHANICS	5,039	75
518	INDUSTRIAL MACHINERY REPAIRERS	333
519	MACHINERY MAINTENANCE OCCUPATIONS	43
535	CAMERA, WATCH, AND MUSICAL INSTRUMENT REPAIRERS	3,476
544	MILLWRIGHTS	371
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	1,010
549	NOT SPECIFIED MECHANICS AND REPAIRERS	2,950
575	ELECTRICIANS	174
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	2,133	17
597	STRUCTURAL METAL WORKERS	3,564
614	DRILLERS, OIL WELL	1,873
633	SUPERVISORS, PRODUCTION OCCUPATIONS	744
637	MACHINISTS	4,640	8
643	BOILERMAKERS	99	6
646	LAY-OUT WORKERS	319
653	SHEET METAL WORKERS	387
676	PATTERNMAKERS, LAY-OUT WORKERS, AND CUTTERS	203	11
684	MISCELLANEOUS PRECISION WORKERS, N.E.C.	791
699	MISCELLANEOUS PLANT AND SYSTEM OPERATORS	653
706	PUNCHING AND STAMPING PRESS MACHINE OPERATORS	888
707	ROLLING MACHINE OPERATORS	2,166
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	609
756	MIXING AND BLENDING MACHINE OPERATORS	24
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	49
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	68
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	746
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	1,881	71
779	MACHINE OPERATORS, NOT SPECIFIED	314
783	WELDERS AND CUTTERS	30,990	73
785	ASSEMBLERS	4,856	31
787	HAND MOLDING, CASTING, AND FORMING OCCUPATIONS	293
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	341
849	CRANE AND TOWER OPERATORS	169
853	EXCAVATING AND LOADING MACHINE OPERATORS	781
855	GRADER, DOZER, AND SCRAPER OPERATORS	468
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	921
873	PRODUCTION HELPERS	163
885	GARAGE AND SERVICE STATION RELATED OCCUPATIONS	2,363
887	VEHICLE WASHERS AND EQUIPMENT CLEANERS	905
889	LABORERS, EXCEPT CONSTRUCTION	636	43
TOTAL		98,752	424

*(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.