Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
223	BIOLOGICAL TECHNICIANS	59	59
365	STOCK AND INVENTORY CLERKS	1,293	415
389	ADMINISTRATIVE SUPPORT OCCUPATIONS, N.E.C.	1,462
444	MISCELLANEOUS FOOD PREPARATION OCCUPATIONS	258	228
453	JANITORS AND CLEANERS	21,394	410
503	SUPERVISORS, MECHANICS AND REPAIRERS	719
505	AUTOMOBILE MECHANICS	1,009
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	1,163
516	HEAVY EQUIPMENT MECHANICS	3,019	81
518	INDUSTRIAL MACHINERY REPAIRERS	788
533	MISCELLANEOUS ELECTRICAL AND ELECTRONIC EQUIPMENT REPAIRERS	3
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	1,042
544	MILLWRIGHTS	455
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	2,304	71
549	NOT SPECIFIED MECHANICS AND REPAIRERS	6,575	17
563	BRICKMASONS AND STONEMASONS	100
575	ELECTRICIANS	121
577	ELECTRICAL POWER INSTALLERS AND REPAIRERS	6,935	147
579	PAINTERS, CONSTRUCTION AND MAINTENANCE	465	297
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	15,136	169
593	INSULATION WORKERS	5,892
595	ROOFERS	80
596	SHEETMETAL DUCT INSTALLERS	171	7
597	STRUCTURAL METAL WORKERS	2,540
633	SUPERVISORS, PRODUCTION OCCUPATIONS	413
634	TOOL AND DIE MAKERS	2,016	13
637	MACHINISTS	2,738	133
643	BOILERMAKERS	6,437
653	SHEET METAL WORKERS	308
688	FOOD BATCHMAKERS	710
696	STATIONARY ENGINEERS	96
699	MISCELLANEOUS PLANT AND SYSTEM OPERATORS	256
723	METAL PLATING MACHINE OPERATORS	32
725	MISCELLANEOUS METAL AND PLASTIC PROCESSING MACHINE OPERATORS	329	34
753	CEMENTING AND GLUING MACHINE OPERATORS	796	530
754	PACKAGING AND FILLING MACHINE OPERATORS	668	158
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	3,950
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	421
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	101	5
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	773	592
779	MACHINE OPERATORS, NOT SPECIFIED	1,183
783	WELDERS AND CUTTERS	49,815	398
785	ASSEMBLERS	5,169
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	542
804	TRUCK DRIVERS, HEAVY	6
844	OPERATING ENGINEERS	85
853	EXCAVATING AND LOADING MACHINE OPERATORS	781
855	GRADER, DOZER, AND SCRAPER OPERATORS	468
869	CONSTRUCTION LABORERS	3,103	5
873	PRODUCTION HELPERS	145
885	GARAGE AND SERVICE STATION RELATED OCCUPATIONS	2,363
887	VEHICLE WASHERS AND EQUIPMENT CLEANERS	391	58
889	LABORERS, EXCEPT CONSTRUCTION	41
TOTAL		157,117	3,824

*(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.