October 4, 1873.] 213 … of the work of civilization. The collections in this depart- independently of the American. Piracy is probably not un- THE GREAT EXPOSITION-LETTERFROM UNITED STATES ment are not as extensive as they might be, or as they were usual in those countries where the patent code is so incom- COMMISSIONER…
Patents · Heat · Consists · Iron · Improved · Specific heat · Center · Diamond cutting · Crude oil · Horse power · Steam boiler · Scientific American · Sewing machine · Steam engine · Secondary spectrum · Steam engines
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