Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	1,367
527	TELEPHONE LINE INSTALLERS AND REPAIRERS	225
529	TELEPHONE INSTALLERS AND REPAIRERS	4,724
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	117
544	MILLWRIGHTS	614
549	NOT SPECIFIED MECHANICS AND REPAIRERS	666
597	STRUCTURAL METAL WORKERS	33
633	SUPERVISORS, PRODUCTION OCCUPATIONS	125
634	TOOL AND DIE MAKERS	1,722	13
637	MACHINISTS	691
643	BOILERMAKERS	98
653	SHEET METAL WORKERS	2,269
706	PUNCHING AND STAMPING PRESS MACHINE OPERATORS	163
708	DRILLING AND BORING MACHINE OPERATORS	65
717	FABRICATING MACHINE OPERATORS, N.E.C.	33
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	69
769	SLICING AND CUTTING MACHINE OPERATORS	163
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	65
779	MACHINE OPERATORS, NOT SPECIFIED	204
783	WELDERS AND CUTTERS	2,567	5
784	SOLDERERS AND BRAZERS	38
785	ASSEMBLERS	1,864
796	PRODUCTION INSPECTORS, CHECKERS, AND EXAMINERS	510
799	GRADERS AND SORTERS, EXCEPT AGRICULTURAL	392
849	CRANE AND TOWER OPERATORS	163
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	33
873	PRODUCTION HELPERS	1,046	33
TOTAL		20,027	51

*(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.