Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
083	MEDICAL SCIENTISTS	41	31
335	FILE CLERKS	192
365	STOCK AND INVENTORY CLERKS	192
453	JANITORS AND CLEANERS	3,681
516	HEAVY EQUIPMENT MECHANICS	402
529	TELEPHONE INSTALLERS AND REPAIRERS	3,172
549	NOT SPECIFIED MECHANICS AND REPAIRERS	192
558	SUPERVISORS, N.E.C.	805
567	CARPENTERS	105
575	ELECTRICIANS	3,601
597	STRUCTURAL METAL WORKERS	5,149	141
599	CONSTRUCTION TRADES, N.E.C.	20
633	SUPERVISORS, PRODUCTION OCCUPATIONS	45
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	950
779	MACHINE OPERATORS, NOT SPECIFIED	58
783	WELDERS AND CUTTERS	283
804	TRUCK DRIVERS, HEAVY	962
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	962
859	MISCELLANEOUS MATERIAL MOVING EQUIPMENT OPERATORS	1,340
869	CONSTRUCTION LABORERS	7,136
889	LABORERS, EXCEPT CONSTRUCTION	1,698
TOTAL		30,988	172

*(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.