... At the foot of the nearest piece, stood the operator, rod in hand, and with impassive face... 
Vicente Blasco Ibanez Charlotte Brewster Jordan 「The Four Horsemen of the Apocalypse」
...The opening cuts having been made, the broad-pointed “skinning-knife”was duly sharpened, and with it the operator fell to work to detach theskin from the body in the shortest possible time...
William T. Hornaday 「The Extermination of the American Bison」
...The point being selected, the instrument is pushed gentlyinto the flesh; and when the operator feels no resistance is offered tothe progress of the tube, he knows the cavity has been pierced...
Dinks, Mayhew, and Hutchinson 「The Dog」
...In performing such operations it is desirable tothrow, or cast, the animal, and to have its head held securely, so as to enablethe operator to do what is necessary without difficulty...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...If the cow is lying, the operator should first secure the foot on the upper side and then, if necessary, turn the cow on its opposite side so as to bring up the other...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...For this the operator had better dress as for aparturition case...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...—A surgical operation becomes necessary for theirremoval— one requiring a skilled operator...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...When spraying, the operator should see to it that neither he nor the animalsinhale any of the spray...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
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