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Patents for Benjamin C. Tilghman
Patents 1 - 2 of 2
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NumberDatePatenteeTitleType
108,408Oct. 18, 1870B.C. TilghmanImprovement in cutting and engraving stone, metal, glass, &c.
416,873Dec. 10, 1889B.C. TilghmanCutting Metals by Electricityelectrical discharge machining
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