Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
048	CHEMICAL ENGINEERS	26
224	CHEMICAL TECHNICIANS	71	6
453	JANITORS AND CLEANERS	1,129
535	CAMERA, WATCH, AND MUSICAL INSTRUMENT REPAIRERS	23
575	ELECTRICIANS	3
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	6
633	SUPERVISORS, PRODUCTION OCCUPATIONS	39
637	MACHINISTS	6
649	ENGRAVERS, METAL	217
734	PRINTING MACHINE OPERATORS	608
735	PHOTOENGRAVERS AND LITHOGRAPHERS	239
736	TYPESETTERS AND COMPOSITORS	923
756	MIXING AND BLENDING MACHINE OPERATORS	4,715	261
774	PHOTOGRAPHIC PROCESS MACHINE OPERATORS	20
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	488	128
TOTAL		8,511	396

*(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.