Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
216	ENGINEERING TECHNICIANS, N.E.C.	15
453	JANITORS AND CLEANERS	454	166
516	HEAVY EQUIPMENT MECHANICS	770
526	HOUSEHOLD APPLIANCE AND POWER TOOL REPAIRERS	248
549	NOT SPECIFIED MECHANICS AND REPAIRERS	2,077
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	74
645	PATTERNMAKERS AND MODEL MAKERS, METAL	1,193	852
653	SHEET METAL WORKERS	120
783	WELDERS AND CUTTERS	1,512	601
785	ASSEMBLERS	2,405	1,202
TOTAL		8,868	2,822

*(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.