Technical supply co., Scranton. [from old catalog] · Scranton, Pa., Technical supply co · leaf 165
f=fe BOUCHER CALCULATOR … 1398 The Boucher Calculator is made similar to an ordinary stem-windingwatch, with glass-covered dials back and front. Ratios are set off by meansof pointers which, as well as the movable dial, are turned by means of thestem-winder key. It is IYiq inches in diameter by %6 inch thick, and doesnot…
Engineering instruments · Drawing instruments
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