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US Patent: 825,150
Attachment for Carpenters' Squares
Patentee: Robert L. McCartney (exact or similar names) - Ottumwa, IA USPTO Classifications: 33/423 Tool Categories: layout tools : squares Assignees: None Manufacturer: Not known to have been produced Witnesses: Sumner Siberell Ina M. Criley Robert Everett James L. Norris, Jr.	Patent Dates: Applied: Jan. 18, 1905 Granted: Jul. 03, 1906 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This design is for a secondary arm to be attached to a standard framing square, to allow it to be more easily used for laying out rafters and stairs.

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