Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
085	DENTISTS	36
453	JANITORS AND CLEANERS	1,849
534	HEATING, AIR CONDITIONING, AND REFRIGERATION MECHANICS	243
678	DENTAL LABORATORY AND MEDICAL APPLIANCE TECHNICIANS	35	21
706	PUNCHING AND STAMPING PRESS MACHINE OPERATORS	535
707	ROLLING MACHINE OPERATORS	778
724	HEAT TREATING EQUIPMENT OPERATORS	243
755	EXTRUDING AND FORMING MACHINE OPERATORS	1,411
766	FURNACE, KILN, AND OVEN OPERATORS, EXC. FOOD	438
849	CRANE AND TOWER OPERATORS	568
889	LABORERS, EXCEPT CONSTRUCTION	178
TOTAL		6,314	21

*(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.