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US Patent: 1,402,629
Circle Rule
Patentee: Ernest P. Manly (exact or similar names) - Portsmouth, VA USPTO Classifications: 33/27.03 Tool Categories: layout tools : compasses rules Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 29, 1921 Granted: Jan. 03, 1922 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This ruler features a slot down its center, with a sliding member that rides in the slot and holds a pencil, allowing it to be used as a compass.

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