Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
225	SCIENCE TECHNICIANS, N.E.C.	1,185	474
374	MATERIAL RECORDING, SCHEDULING, AND DISTRIBUTING CLERKS, N.E.C.	5
453	JANITORS AND CLEANERS	2,935	3
516	HEAVY EQUIPMENT MECHANICS	27
518	INDUSTRIAL MACHINERY REPAIRERS	21
519	MACHINERY MAINTENANCE OCCUPATIONS	37
544	MILLWRIGHTS	892
547	SPECIFIED MECHANICS AND REPAIRERS, N.E.C.	78
549	NOT SPECIFIED MECHANICS AND REPAIRERS	580	4
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	48
633	SUPERVISORS, PRODUCTION OCCUPATIONS	1,185
643	BOILERMAKERS	40
696	STATIONARY ENGINEERS	13
707	ROLLING MACHINE OPERATORS	29
709	GRINDING, ABRADING, BUFFING, AND POLISHING MACHINE OPERATORS	53
724	HEAT TREATING EQUIPMENT OPERATORS	11
756	MIXING AND BLENDING MACHINE OPERATORS	5
757	SEPARATING, FILTERING, AND CLARIFYING MACHINE OPERATORS	69
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	3
769	SLICING AND CUTTING MACHINE OPERATORS	1,913	90
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	13
779	MACHINE OPERATORS, NOT SPECIFIED	92	5
849	CRANE AND TOWER OPERATORS	27
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	3
873	PRODUCTION HELPERS	16
889	LABORERS, EXCEPT CONSTRUCTION	3,791
TOTAL		13,071	576

*(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.