MACHINERY, EXCEPT ELECTRICAL (SIC 35)
Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
779	MACHINE OPERATORS, NOT SPECIFIED	146
889	LABORERS, EXCEPT CONSTRUCTION	1,412
SUBTOTAL		1,558
RAILROAD TRANSPORTATION (SIC 40)
Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
585	PLUMBERS, PIPEFITTERS, AND STEAMFITTERS	174
SUBTOTAL		174
TOTAL		1,732
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.