Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
059	ENGINEERS, N.E.C.	12
453	JANITORS AND CLEANERS	1,729
518	INDUSTRIAL MACHINERY REPAIRERS	278
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	15
544	MILLWRIGHTS	560
563	BRICKMASONS AND STONEMASONS	263
643	BOILERMAKERS	48
675	HAND MOLDERS AND SHAPERS, EXCEPT JEWELERS	380
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	145
719	MOLDING AND CASTING MACHINE OPERATORS	262
724	HEAT TREATING EQUIPMENT OPERATORS	100
756	MIXING AND BLENDING MACHINE OPERATORS	184
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	566
769	SLICING AND CUTTING MACHINE OPERATORS	81
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	1,517	43
779	MACHINE OPERATORS, NOT SPECIFIED	130
785	ASSEMBLERS	385
849	CRANE AND TOWER OPERATORS	162
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	62
889	LABORERS, EXCEPT CONSTRUCTION	670
TOTAL		7,550	43

*(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.