n a prize competitionheld by The Keystone, and will befound of value to every one doingengraving. The designs are conceded to bethe best in the market, excelling inart and novelty of combination andskill in execution. They are printed from steel plateson stiff, durable paper, and containsample… … published by The Keystone, THE ORGAN OF THE JEWELRY AND OPTICAL TRADES, 19TH & Brown Sts., Philadelphia, U.S.A. THE OPTICIANS MANUAL VOL. I. By C. H. Brown, M. D. Graduate University of Pennsylvania; Professor of Optics and Refraction ; formerly Physician in Philadelphia Hospital; Member of…
Clocks and watches
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