Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
225	SCIENCE TECHNICIANS, N.E.C.	518
453	JANITORS AND CLEANERS	835
518	INDUSTRIAL MACHINERY REPAIRERS	237
567	CARPENTERS	5,589
575	ELECTRICIANS	2,330
588	CONCRETE AND TERRAZZO FINISHERS	57
675	HAND MOLDERS AND SHAPERS, EXCEPT JEWELERS	403
756	MIXING AND BLENDING MACHINE OPERATORS	259
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	457
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	443
779	MACHINE OPERATORS, NOT SPECIFIED	2,375
804	TRUCK DRIVERS, HEAVY	3,033
844	OPERATING ENGINEERS	54
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	363
869	CONSTRUCTION LABORERS	16,101	71
878	MACHINE FEEDERS AND OFFBEARERS	181
889	LABORERS, EXCEPT CONSTRUCTION	2,422
TOTAL		35,658	71

*(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.