Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	191
633	SUPERVISORS, PRODUCTION OCCUPATIONS	191
756	MIXING AND BLENDING MACHINE OPERATORS	594	54
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	270
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	467
768	CRUSHING AND GRINDING MACHINE OPERATORS	172
883	FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C.	118	79
TOTAL		2,005	133

*(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.