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US Patent: 2,990,171
Mobile, separable work holder
Patentees: James E. Grove (exact or similar names) - Hamilton, OH John E. Chamberlain (exact or similar names) - Middletown, OH USPTO Classifications: 269/309, 269/59, 269/60, 269/61 Tool Categories: Assignees: Hamilton Tool Co. - Hamilton, OH Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Dec. 12, 1958 Granted: Jun. 27, 1961 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Hamilton Tool Co.

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