Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	118
516	HEAVY EQUIPMENT MECHANICS	156
549	NOT SPECIFIED MECHANICS AND REPAIRERS	13
723	METAL PLATING MACHINE OPERATORS	18	12
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	12
783	WELDERS AND CUTTERS	2,848
785	ASSEMBLERS	145
853	EXCAVATING AND LOADING MACHINE OPERATORS	781
855	GRADER, DOZER, AND SCRAPER OPERATORS	468
TOTAL		4,560	12

*(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.