Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	625
516	HEAVY EQUIPMENT MECHANICS	130
567	CARPENTERS	477
596	SHEETMETAL DUCT INSTALLERS	456
653	SHEET METAL WORKERS	2,209
675	HAND MOLDERS AND SHAPERS, EXCEPT JEWELERS	232
696	STATIONARY ENGINEERS	123	59
728	SHAPING AND JOINING MACHINE OPERATORS	1,954	1,042
756	MIXING AND BLENDING MACHINE OPERATORS	240
769	SLICING AND CUTTING MACHINE OPERATORS	71	18
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	18
783	WELDERS AND CUTTERS	217	31
785	ASSEMBLERS	1,572	746
889	LABORERS, EXCEPT CONSTRUCTION	390
TOTAL		8,712	1,896

*(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.