Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	63
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	1,866
633	SUPERVISORS, PRODUCTION OCCUPATIONS	63
637	MACHINISTS	26
653	SHEET METAL WORKERS	570
706	PUNCHING AND STAMPING PRESS MACHINE OPERATORS	1,530	274
707	ROLLING MACHINE OPERATORS	13
769	SLICING AND CUTTING MACHINE OPERATORS	127
783	WELDERS AND CUTTERS	190
785	ASSEMBLERS	2,849	137
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	225
889	LABORERS, EXCEPT CONSTRUCTION	127
TOTAL		7,650	411

*(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.