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US Patent: 803,292
Folding Rule
Patentee: Carl E. Keefer (exact or similar names) - Morrell, PA USPTO Classifications: 403/62 Tool Categories: rules : folding rules : folding rule joints layout tools : squares Assignees: None Manufacturer: Not known to have been produced Witnesses: C. O. Templeton Allie Walker	Patent Dates: Applied: Dec. 29, 1904 Granted: Oct. 31, 1905 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.
Description: Joint has a locking plate to allow the rule to be used as a square as well.

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