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US Patent: 378,894
Pocket-Rule
Patentee: Joseph McLean (exact or similar names) - Rockville, CT USPTO Classifications: 403/93 Tool Categories: rules : folding rules : folding rule joints Assignees: None Manufacturer: Not known to have been produced Witnesses: Chas. L. Burdett M. H. Hughes W. M. Dyorkman H. R. Williams	Patent Dates: Applied: Mar. 16, 1887 Granted: Mar. 06, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This design adds a sprint-activated ratcheting detent to a standard rule joint, allowing it to accurately hold a specific angle.

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