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US Patent: 1,862,499
Horseshoe Calk
Patentee: Arthur R. Swanstrom (exact or similar names) - Duluth, MN USPTO Classifications: 168/41 Tool Categories: Assignees: Diamond Calk and Horseshoe Co. - Duluth, MN Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Nov. 19, 1930 Granted: Jun. 07, 1932 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen Diamond's history

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