半色调雕刻设计:如何获得专利,Copp & Co.专利律师事务所,华盛顿特区(Design for a Half-tone Engraving: How to Obtain a Patent, Copp & Co. Patent Attorneys, Washington, D.C.)詹姆斯·亨利·摩泽 |
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日期不详 · Pen and black ink, brush and gouache, graphite on paper, laid down on brown board
· 图片ID: 1287309
Smithsonian Institution, Gift of Louis Cohen |
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