Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	301
518	INDUSTRIAL MACHINERY REPAIRERS	386
519	MACHINERY MAINTENANCE OCCUPATIONS	5
613	SUPERVISORS, EXTRACTIVE OCCUPATIONS	178
614	DRILLERS, OIL WELL	338
617	MINING OCCUPATIONS, N.E.C.	500
703	LATHE AND TURNING MACHINE SET-UP OPERATORS	14
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	136
779	MACHINE OPERATORS, NOT SPECIFIED	338
784	SOLDERERS AND BRAZERS	34
785	ASSEMBLERS	812	777
804	TRUCK DRIVERS, HEAVY	118
848	HOIST AND WINCH OPERATORS	355
878	MACHINE FEEDERS AND OFFBEARERS	676
889	LABORERS, EXCEPT CONSTRUCTION	34
TOTAL		4,226	777

*(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.