Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
044	AEROSPACE ENGINEERS	11
073	CHEMISTS, EXCEPT BIOCHEMISTS	158	16
225	SCIENCE TECHNICIANS, N.E.C.	124
235	TECHNICIANS, N.E.C.	12
453	JANITORS AND CLEANERS	403
518	INDUSTRIAL MACHINERY REPAIRERS	49
549	NOT SPECIFIED MECHANICS AND REPAIRERS	553
563	BRICKMASONS AND STONEMASONS	166
567	CARPENTERS	62
575	ELECTRICIANS	448
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	193	12
633	SUPERVISORS, PRODUCTION OCCUPATIONS	201
637	MACHINISTS	49
696	STATIONARY ENGINEERS	82
715	MISCELLANEOUS METAL, PLASTIC, STONE, AND GLASS WORKING MACHINE OPERATORS	71
756	MIXING AND BLENDING MACHINE OPERATORS	124
763	ROASTING AND BAKING MACHINE OPERATORS, FOOD	864	29
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	634
768	CRUSHING AND GRINDING MACHINE OPERATORS	14
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	703
783	WELDERS AND CUTTERS	70
785	ASSEMBLERS	20	20
849	CRANE AND TOWER OPERATORS	71
865	HELPERS, CONSTRUCTION TRADES	288
888	HAND PACKERS AND PACKAGERS	342
889	LABORERS, EXCEPT CONSTRUCTION	1,961
TOTAL		7,677	78

*(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.