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US Patent: 249,143
Expanding Mandrel
Patentee: Herbert Cottrell (exact or similar names) - Newark, Essex County, NJ USPTO Classifications: 81/446, 82/167, 82/168, 82/169, 82/170 Tool Categories: metalworking tools : mandrels and arbors Assignees: Herbert Cottrell - Newark, Essex County, NJ Howard C. Condit - Newark, Essex County, NJ Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 05, 1881 Granted: Nov. 01, 1881 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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