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US Patent: 543,625
Machine for Boring Joists for Electric Wiring
Patentees: John G. Henderson (exact or similar names) - Chicago, IL Robert H. Henderson (exact or similar names) - Chicago, IL USPTO Classifications: 173/31, 408/124, 408/234 Tool Categories: woodworking machines : joint making machines : portable timber borers woodworking machines : wood drilling and boring : portable timber borers Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 03, 1894 Granted: Jul. 30, 1895 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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