...But I did sell out,and some unknown operator bought in at once, and closed for readymoney, and has sold again this morning; and after all that hashappened, it will be impossible to track him... 
Grant Allen 「An African Millionaire」
...While no secondtest is made of the eggs left in the machines theexperienced incubator operator is constantly on thewatch for and is constantly removing any eggswhich die at a later time...
Harry M. Lamon 「Ducks and Geese」
...The inexperienced operator can readily locatedead eggs by smelling over the tray...
Harry M. Lamon 「Ducks and Geese」
...The amount of cooling which the eggs requireseems to vary greatly and here again the judgmentof the operator comes into play...
Harry M. Lamon 「Ducks and Geese」
...They becomeinstantly sensible that no punishment is intended to be inflicted, andI have seen them lick the hand of the operator, as if grateful forwhat he was doing...
Edward Jesse 「Anecdotes of Dogs」
...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」
...Even should the proprietor be silent, the reputation ofthe operator will be injured; for, when the knife is resorted to, mankindwill not tolerate failure...
Dinks, Mayhew, and Hutchinson 「The Dog」
...The operator must not be impatient, for thestream is perfectly passive; since, in consequence of the distension, thebladder has lost its contractive power...
Dinks, Mayhew, and Hutchinson 「The Dog」
...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」
...Meanwhile the operator may secure an opportunity of reaching andseizing the nose or of passing a blunt hook into the angle of the mouth...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...The operator should smear his armswith carbolized lard or vaseline to protect them against infection, andparticularly in delayed cases with putrid membranes...
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」
...The operator should now make anopening through the peritoneum, which is best done with the fingers...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
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