Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
453	JANITORS AND CLEANERS	3,898	414
507	BUS, TRUCK, AND STATIONARY ENGINE MECHANICS	1,666
516	HEAVY EQUIPMENT MECHANICS	58
518	INDUSTRIAL MACHINERY REPAIRERS	723
519	MACHINERY MAINTENANCE OCCUPATIONS	218
544	MILLWRIGHTS	1,240
549	NOT SPECIFIED MECHANICS AND REPAIRERS	1,412	3
563	BRICKMASONS AND STONEMASONS	185
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	3,990
634	TOOL AND DIE MAKERS	1,722	13
637	MACHINISTS	61
695	POWER PLANT OPERATORS	69
708	DRILLING AND BORING MACHINE OPERATORS	245
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	23
769	SLICING AND CUTTING MACHINE OPERATORS	451
785	ASSEMBLERS	346	52
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	3
864	HELPERS, MECHANICS AND REPAIRERS	19
885	GARAGE AND SERVICE STATION RELATED OCCUPATIONS	7
TOTAL		16,335	483

*(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.