Patent No 238,387 character plate.jpg
Thomas Hall - inventor
en
Patent No 238,387 character plate, United States patent drawings, Thomas Hall (mechanic)
commons
en
Patent No 238,387 character plate, Patent No 238,387 character plate, Patent No 238,387 character plate
commons
ja
特許番号238,387文字板、米国特許図面、トーマスホール(機械)
commons_translated
ja
特許番号238,387文字板、特許番号223,387文字板、特許番号223,387文字板
commons_translated
patent law patent patency patented patent right character