Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
357	MESSENGERS	278
453	JANITORS AND CLEANERS	81	7
519	MACHINERY MAINTENANCE OCCUPATIONS	271
575	ELECTRICIANS	338
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	433
653	SHEET METAL WORKERS	88
749	MISCELLANEOUS TEXTILE MACHINE OPERATORS	122
753	CEMENTING AND GLUING MACHINE OPERATORS	616
756	MIXING AND BLENDING MACHINE OPERATORS	183
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	54
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	20
769	SLICING AND CUTTING MACHINE OPERATORS	27
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	934	7
779	MACHINE OPERATORS, NOT SPECIFIED	41
783	WELDERS AND CUTTERS	102
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	156
873	PRODUCTION HELPERS	108
878	MACHINE FEEDERS AND OFFBEARERS	88
TOTAL		3,940	14

*(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.