Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
364	TRAFFIC, SHIPPING, AND RECEIVING CLERKS	124
453	JANITORS AND CLEANERS	5,118
505	AUTOMOBILE MECHANICS	590
518	INDUSTRIAL MACHINERY REPAIRERS	831
549	NOT SPECIFIED MECHANICS AND REPAIRERS	1,218
637	MACHINISTS	86
744	TEXTILE SEWING MACHINE OPERATORS	2,672	2,486
749	MISCELLANEOUS TEXTILE MACHINE OPERATORS	1,119	994
779	MACHINE OPERATORS, NOT SPECIFIED	684	684
783	WELDERS AND CUTTERS	323
844	OPERATING ENGINEERS	531
TOTAL		13,296	4,163

*(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.