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US Patent: 138,005
Improvement in machines for finishing slate-frames
Patentees: George S. Coffin (exact or similar names) - Danielsville, PA James H. Coffin (exact or similar names) - Danielsville, PA USPTO Classifications: 144/145.2 Tool Categories: woodworking machines : specialty woodworking machines Assignees: None Manufacturer: Not known to have been produced Witnesses: John M. Hower George Leibenguth	Patent Dates: Applied: Feb. 25, 1873 Granted: Apr. 22, 1873 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin

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