Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
216	ENGINEERING TECHNICIANS, N.E.C.	29
453	JANITORS AND CLEANERS	214
516	HEAVY EQUIPMENT MECHANICS	1,040
633	SUPERVISORS, PRODUCTION OCCUPATIONS	271
644	PRECISION GRINDERS, FITTERS, AND TOOL SHARPENERS	255
736	TYPESETTERS AND COMPOSITORS	999
783	WELDERS AND CUTTERS	817	78
784	SOLDERERS AND BRAZERS	115	100
785	ASSEMBLERS	2,650	229
869	CONSTRUCTION LABORERS	911
TOTAL		7,301	408

*(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.