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US Patent: 185,159
Expanding Mandrels for Turning Piston Rings
Patentees: La Roy Bartlett (exact or similar names) - St. Louis, MO Winthrop Bartlett (exact or similar names) - St. Louis, MO USPTO Classifications: 157/9, 29/888.073, 451/398, 82/138, 82/165, 82/169 Tool Categories: metalworking tools : mandrels and arbors Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jul. 18, 1876 Granted: Dec. 12, 1876 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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