Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	564
518	INDUSTRIAL MACHINERY REPAIRERS	93
544	MILLWRIGHTS	576
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	186
549	NOT SPECIFIED MECHANICS AND REPAIRERS	496
637	MACHINISTS	1,861
706	PUNCHING AND STAMPING PRESS MACHINE OPERATORS	29
779	MACHINE OPERATORS, NOT SPECIFIED	204
783	WELDERS AND CUTTERS	131
TOTAL		4,140

*(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.