SIC	Industry Description (1972)	Total # Employees (Male & Female)	Total # Female Employees
28	CHEMICALS AND ALLIED PRODUCTS	711	3
35	MACHINERY, EXCEPT ELECTRICAL	2,397
36	ELECTRIC AND ELECTRONIC EQUIPMENT	4,143	1,819
37	TRANSPORTATION EQUIPMENT	1,921	167
38	INSTRUMENTS AND RELATED PRODUCTS	824
45	TRANSPORTATION BY AIR	1,713	28
TOTAL		11,709	2,018

*(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.