Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
327	ORDER CLERKS	1,579
368	WEIGHERS, MEASURERS, AND CHECKERS	109
453	JANITORS AND CLEANERS	540	16
516	HEAVY EQUIPMENT MECHANICS	619
518	INDUSTRIAL MACHINERY REPAIRERS	412	18
527	TELEPHONE LINE INSTALLERS AND REPAIRERS	723
539	MECHANICAL CONTROLS AND VALVE REPAIRERS	347
549	NOT SPECIFIED MECHANICS AND REPAIRERS	396
557	SUPERVISORS; PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	3,250
575	ELECTRICIANS	109
577	ELECTRICAL POWER INSTALLERS AND REPAIRERS	3,653
633	SUPERVISORS, PRODUCTION OCCUPATIONS	74
634	TOOL AND DIE MAKERS	36
637	MACHINISTS	72
755	EXTRUDING AND FORMING MACHINE OPERATORS	174
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	28
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	44
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	672	44
869	CONSTRUCTION LABORERS	2,026
TOTAL		14,863	78

*(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.