Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	1,205
519	MACHINERY MAINTENANCE OCCUPATIONS	58
549	NOT SPECIFIED MECHANICS AND REPAIRERS	206
637	MACHINISTS	7,400	107
717	FABRICATING MACHINE OPERATORS, N.E.C.	262	22
719	MOLDING AND CASTING MACHINE OPERATORS	19	12
754	PACKAGING AND FILLING MACHINE OPERATORS	68
756	MIXING AND BLENDING MACHINE OPERATORS	98
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	1,284	31
779	MACHINE OPERATORS, NOT SPECIFIED	2,854
783	WELDERS AND CUTTERS	249
785	ASSEMBLERS	6,994
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	215
889	LABORERS, EXCEPT CONSTRUCTION	98
TOTAL		21,007	171

*(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.