Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
224	CHEMICAL TECHNICIANS	2,320	356
225	SCIENCE TECHNICIANS, N.E.C.	1,185	474
453	JANITORS AND CLEANERS	1,018
458	HAIRDRESSERS AND COSMETOLOGISTS	304	304
519	MACHINERY MAINTENANCE OCCUPATIONS	22
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	366
549	NOT SPECIFIED MECHANICS AND REPAIRERS	470
567	CARPENTERS	57
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	44
593	INSULATION WORKERS	44
633	SUPERVISORS, PRODUCTION OCCUPATIONS	1,300
637	MACHINISTS	57
647	PRECIOUS STONES AND METALS WORKERS (JEWELERS)	183
653	SHEET METAL WORKERS	75
694	WATER AND SEWAGE TREATMENT PLANT OPERATORS	66
699	MISCELLANEOUS PLANT AND SYSTEM OPERATORS	114
734	PRINTING MACHINE OPERATORS	1,253	739
735	PHOTOENGRAVERS AND LITHOGRAPHERS	18
756	MIXING AND BLENDING MACHINE OPERATORS	1,203
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	135
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	717
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	9
873	PRODUCTION HELPERS	576
889	LABORERS, EXCEPT CONSTRUCTION	3,791
TOTAL		15,327	1,873

*(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.