Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
365	STOCK AND INVENTORY CLERKS	109
453	JANITORS AND CLEANERS	671	29
516	HEAVY EQUIPMENT MECHANICS	548
518	INDUSTRIAL MACHINERY REPAIRERS	75
549	NOT SPECIFIED MECHANICS AND REPAIRERS	792
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	100	6
637	MACHINISTS	1,418
704	LATHE AND TURNING MACHINE OPERATORS	870
779	MACHINE OPERATORS, NOT SPECIFIED	806
783	WELDERS AND CUTTERS	675
873	PRODUCTION HELPERS	180
TOTAL		6,244	36

*(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.