Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
019	MANAGERS AND ADMINISTRATORS, N.E.C.	378
453	JANITORS AND CLEANERS	993
516	HEAVY EQUIPMENT MECHANICS	199
518	INDUSTRIAL MACHINERY REPAIRERS	627
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	288
598	DRILLERS, EARTH	3,446
633	SUPERVISORS, PRODUCTION OCCUPATIONS	37
637	MACHINISTS	221
676	PATTERNMAKERS, LAY-OUT WORKERS, AND CUTTERS	378
696	STATIONARY ENGINEERS	78
783	WELDERS AND CUTTERS	1,290
889	LABORERS, EXCEPT CONSTRUCTION	179
TOTAL		8,115

*(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.