SPECIAL TRADE CONTRACTORS (SIC 17)
Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
575	ELECTRICIANS	6,622
576	ELECTRICIAN APPRENTICES	368
SUBTOTAL		6,990
CHEMICALS AND ALLIED PRODUCTS (SIC 28)
Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
756	MIXING AND BLENDING MACHINE OPERATORS	605	510
878	MACHINE FEEDERS AND OFFBEARERS	382	287
SUBTOTAL		987	797
PRIMARY METAL INDUSTRIES (SIC 33)
Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	2,843
SUBTOTAL		2,843
TRANSPORTATION EQUIPMENT (SIC 37)
Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
549	NOT SPECIFIED MECHANICS AND REPAIRERS	2,414	302
567	CARPENTERS	6,427
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	1,257
643	BOILERMAKERS	48
SUBTOTAL		10,146	302
TOTAL		20,966	1,099
RELATED PAGES: Estimates by SIC, Estimates by Occupation

*(1) The estimates for each occupation apply only to the 3- and 4-digit SICs surveyed within the 2-digit SIC where the agent was observed. Not all SICs were surveyed, and not all agents were observed in all surveyed SICs. (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.