... 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 inexperienced operator can readily locatedead eggs by smelling over the tray...
Harry M. Lamon 「Ducks and Geese」
...Most inventors of "worm pills" andthe like order castor oil to be given after their boluses,a terrible aggravation both to operator and patient...
Mrs. Leslie Williams 「A Manual of Toy Dogs」
...The operator then severs these two ovaries, either by cutting ortearing, and returns the womb and its appurtenances to their properposition...
Robert Jennings 「Sheep, Swine, and Poultry」
...The udder and teats and the hands of the operator must bewell disinfected, and the solution must be freshly made with recently boiledwater kept in a sterile bottle...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The success of the operation depends chiefly on the skill of the operator, butnot alone in the selection and use of the appliances, for as much attentionmust be given to subsequent management...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The success of surgical operationsdepends on the judgment, skill, and dexterity, as well as upon the knowledge ofthe operator...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Treatment consists in trephining the skull and removing the parasite, anoperation which requires a skillful operator and is frequently unsuccessful...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The arrangements usedin these old hatcheries are crude, and the success of the operationdepends upon exceptional skill and judgment on the part of the operator...
John H. Robinson 「Our Domestic Birds」
...The leech is attracted by this, and comes down the nostril, whenit can be caught if the operator is quick enough...
Joshua A. Nunn 「Notes on Stable Management in India and the Colonies」
...The operator is nearly always alone, even when theprize is a large one, like the Common Snail, Helix aspersa...
Jean Henri Fabre Alexander Teixeira de Mattos 「The Glow-Worm and Other Beetles」
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