Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
224	CHEMICAL TECHNICIANS	2,228	356
453	JANITORS AND CLEANERS	891
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	154
756	MIXING AND BLENDING MACHINE OPERATORS	1,203
779	MACHINE OPERATORS, NOT SPECIFIED	975
TOTAL		5,451	356

*(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.