Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
215	MECHANICAL ENGINEERING TECHNICIANS	58
223	BIOLOGICAL TECHNICIANS	465	78
235	TECHNICIANS, N.E.C.	103
453	JANITORS AND CLEANERS	411
515	AIRCRAFT MECHANICS, EXC. ENGINE	151
637	MACHINISTS	158
645	PATTERNMAKERS AND MODEL MAKERS, METAL	78
684	MISCELLANEOUS PRECISION WORKERS, N.E.C.	588
753	CEMENTING AND GLUING MACHINE OPERATORS	31
TOTAL		2,043	78

*(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.