Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
549	NOT SPECIFIED MECHANICS AND REPAIRERS	5
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	144
596	SHEETMETAL DUCT INSTALLERS	395	17
637	MACHINISTS	428	20
653	SHEET METAL WORKERS	86
719	MOLDING AND CASTING MACHINE OPERATORS	25
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	14
783	WELDERS AND CUTTERS	100	3
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	11
TOTAL		1,209	41

*(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.