Word: kollmorgen
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There are only four makers of military optical instruments in the U. S. One is Kollmorgen (of Brooklyn), which concentrates on periscopes. Another is Keuffel & Esser (of Hoboken, N. J.), which makes range finders, trench periscopes. A third is Spencer-Lens Co., scientific instrument subsidiary of American Optical Co. The fourth is Bausch & Lomb (of Rochester, N. Y.), which makes binoculars, range finders, periscopes, about 50% of all the military optical goods sold...
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