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US Patent: 527,600
Door-Lock-Marking Gage
Patentee: Frank K. Etherington (exact or similar names) - Cambridge, MA USPTO Classifications: 144/27, 33/197 Tool Categories: layout tools : marking gauges : butt gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: Geo. H. Morse Fred A. Morser H. Brown A. C. Harmon	Patent Dates: Applied: Nov. 20, 1893 Granted: Oct. 16, 1894 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: A butt gage that marks not only the position of the mortise for a door lock, but also the location of the knob hole.

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