Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
445	DENTAL ASSISTANTS	58	27
516	HEAVY EQUIPMENT MECHANICS	838
558	SUPERVISORS, N.E.C.	805
637	MACHINISTS	995	8
678	DENTAL LABORATORY AND MEDICAL APPLIANCE TECHNICIANS	169	155
719	MOLDING AND CASTING MACHINE OPERATORS	22
779	MACHINE OPERATORS, NOT SPECIFIED	1,779	1,038
783	WELDERS AND CUTTERS	302
TOTAL		4,968	1,228

*(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.