Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	1,228	18
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	14
518	INDUSTRIAL MACHINERY REPAIRERS	103
519	MACHINERY MAINTENANCE OCCUPATIONS	57
549	NOT SPECIFIED MECHANICS AND REPAIRERS	137
653	SHEET METAL WORKERS	43	6
724	HEAT TREATING EQUIPMENT OPERATORS	10
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	236
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	142
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	236
783	WELDERS AND CUTTERS	145
798	PRODUCTION SAMPLERS AND WEIGHERS	128
TOTAL		2,479	24

*(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.