Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
216	ENGINEERING TECHNICIANS, N.E.C.	133
453	JANITORS AND CLEANERS	1,899
503	SUPERVISORS, MECHANICS AND REPAIRERS	2,429
637	MACHINISTS	691	11
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	4,006
724	HEAT TREATING EQUIPMENT OPERATORS	353
779	MACHINE OPERATORS, NOT SPECIFIED	8,878
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	2,959
TOTAL		21,349	11

*(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.