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US Patent: 1,507,722
Plane Attachment
Patentee: John Allen (exact or similar names) - Fargo, ND USPTO Classifications: 30/478 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Mar. 18, 1924 Granted: Sep. 09, 1924 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen
Description: Says the attachment will lift the blade on the return movement of the plane.

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