SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
15	GENERAL BUILDING CONTRACTORS	1,150
16	HEAVY CONSTRUCTION CONTRACTORS	386
29	PETROLEUM AND COAL PRODUCTS	98
32	STONE, CLAY, AND GLASS PRODUCTS	2,683	1,678
33	PRIMARY METAL INDUSTRIES	1,036	67
35	MACHINERY, EXCEPT ELECTRICAL	157
36	ELECTRIC AND ELECTRONIC EQUIPMENT	20,057	9,074
37	TRANSPORTATION EQUIPMENT	55
38	INSTRUMENTS AND RELATED PRODUCTS	4,720	3,359
73	BUSINESS SERVICES	4,192	767
TOTAL		34,535	14,944

*(1) By survey design, not all 2-digit SICs were surveyed. (2) The estimates for each 2-digit SIC apply only to the 3- and 4-digit SICs surveyed within the 2-digit SIC. Not all SICs were surveyed. (3) When using the estimates, standard errors associated with estimates should be considered. (4) 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.