Code	Occupation Description (1980)	Total # Employees (Male & Female)	Total # Female Employees
223	BIOLOGICAL TECHNICIANS	3,052	872
365	STOCK AND INVENTORY CLERKS	3,546
453	JANITORS AND CLEANERS	84
676	PATTERNMAKERS, LAY-OUT WORKERS, AND CUTTERS	310
686	BUTCHERS AND MEAT CUTTERS	1,800	95
694	WATER AND SEWAGE TREATMENT PLANT OPERATORS	156
696	STATIONARY ENGINEERS	95
734	PRINTING MACHINE OPERATORS	753
737	MISCELLANEOUS PRINTING MACHINE OPERATORS	1,283	837
754	PACKAGING AND FILLING MACHINE OPERATORS	403	24
756	MIXING AND BLENDING MACHINE OPERATORS	24
759	PAINTING AND PAINT SPRAYING MACHINE OPERATORS	568
777	MISCELLANEOUS MACHINE OPERATORS, N.E.C.	3,161	145
779	MACHINE OPERATORS, NOT SPECIFIED	3,546
883	FREIGHT, STOCK, AND MATERIAL MOVERS, HAND, N.E.C.	189
TOTAL		18,971	1,973

*(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.