Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
335	FILE CLERKS	227
449	MAIDS AND HOUSEMEN	119	59
453	JANITORS AND CLEANERS	1,385	232
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	287
549	NOT SPECIFIED MECHANICS AND REPAIRERS	165
748	LAUNDERING AND DRY CLEANING MACHINE OPERATORS	96
754	PACKAGING AND FILLING MACHINE OPERATORS	2,249	97
756	MIXING AND BLENDING MACHINE OPERATORS	28
779	MACHINE OPERATORS, NOT SPECIFIED	486
856	INDUSTRIAL TRUCK AND TRACTOR EQUIPMENT OPERATORS	292
TOTAL		5,332	389

*(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.