Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
365	STOCK AND INVENTORY CLERKS	50
366	METER READERS	2,207
453	JANITORS AND CLEANERS	2,978
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	218
516	HEAVY EQUIPMENT MECHANICS	1,289
518	INDUSTRIAL MACHINERY REPAIRERS	3
539	MECHANICAL CONTROLS AND VALVE REPAIRERS	2,515
544	MILLWRIGHTS	557
549	NOT SPECIFIED MECHANICS AND REPAIRERS	2,603
575	ELECTRICIANS	886
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	3,754
597	STRUCTURAL METAL WORKERS	1,196
637	MACHINISTS	991	24
653	SHEET METAL WORKERS	299
684	MISCELLANEOUS PRECISION WORKERS, N.E.C.	512
696	STATIONARY ENGINEERS	161
715	MISCELLANEOUS METAL, PLASTIC, STONE, AND GLASS WORKING MACHINE OPERATORS	43
734	PRINTING MACHINE OPERATORS	320
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	471
779	MACHINE OPERATORS, NOT SPECIFIED	227
783	WELDERS AND CUTTERS	79
785	ASSEMBLERS	11
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	6
804	TRUCK DRIVERS, HEAVY	5,553
888	HAND PACKERS AND PACKAGERS	808	419
TOTAL		27,736	443

*(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.