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US Patent: D51,900
Design for a tracer and cutter frame for die-sinking machines
Patentee: Joseph F. Keller (exact or similar names) - New York, NY USPTO Classifications: D15/141 Tool Categories: trade specific : tool and die maker : die sinkers Assignees: None Manufacturer: Keller Mechanical Engineering Corp. - Brooklyn, NY Witnesses: Unknown	Patent Dates: Applied: Nov. 30, 1917 Granted: Mar. 26, 1918 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Keller Mechanical Engineering Corp.

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