Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
056	INDUSTRIAL ENGINEERS	16
365	STOCK AND INVENTORY CLERKS	488
374	MATERIAL RECORDING, SCHEDULING, AND DISTRIBUTING CLERKS, N.E.C.	5
453	JANITORS AND CLEANERS	3,918	152
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	933
508	AIRCRAFT ENGINE MECHANICS	795
516	HEAVY EQUIPMENT MECHANICS	27
518	INDUSTRIAL MACHINERY REPAIRERS	356
519	MACHINERY MAINTENANCE OCCUPATIONS	561	7
544	MILLWRIGHTS	897
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	45
549	NOT SPECIFIED MECHANICS AND REPAIRERS	139
575	ELECTRICIANS	235
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	48
599	CONSTRUCTION TRADES, N.E.C.	1,155
637	MACHINISTS	145
643	BOILERMAKERS	40
689	INSPECTORS, TESTERS, AND GRADERS	71	48
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	347
717	FABRICATING MACHINE OPERATORS, N.E.C.	1,153
719	MOLDING AND CASTING MACHINE OPERATORS	167
724	HEAT TREATING EQUIPMENT OPERATORS	163
738	WINDING AND TWISTING MACHINE OPERATORS	819
755	EXTRUDING AND FORMING MACHINE OPERATORS	185
756	MIXING AND BLENDING MACHINE OPERATORS	5
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	960
779	MACHINE OPERATORS, NOT SPECIFIED	630
785	ASSEMBLERS	879	608
849	CRANE AND TOWER OPERATORS	27
873	PRODUCTION HELPERS	347
889	LABORERS, EXCEPT CONSTRUCTION	41
TOTAL		15,600	815

*(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.