Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	272
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	884
549	NOT SPECIFIED MECHANICS AND REPAIRERS	2,414	302
565	TILE SETTERS, HARD AND SOFT	5,655
593	INSULATION WORKERS	6,334	618
595	ROOFERS	4,061
596	SHEETMETAL DUCT INSTALLERS	923
653	SHEET METAL WORKERS	755
723	METAL PLATING MACHINE OPERATORS	201
744	TEXTILE SEWING MACHINE OPERATORS	5,747	5,673
749	MISCELLANEOUS TEXTILE MACHINE OPERATORS	681
755	EXTRUDING AND FORMING MACHINE OPERATORS	755	378
756	MIXING AND BLENDING MACHINE OPERATORS	970
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	252	25
769	SLICING AND CUTTING MACHINE OPERATORS	408	37
783	WELDERS AND CUTTERS	133
785	ASSEMBLERS	36
797	PRODUCTION TESTERS	91
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	227
TOTAL		30,800	7,033

*(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.