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US Patent: 2,116,708
Apparatus for compacting concrete
Patentee: Richard A. Niekamp (exact or similar names) - Dayton, OH USPTO Classifications: 310/81, 366/123 Tool Categories: Assignees: Master Electric Co. - Dayton, OH Manufacturer: Master Electric Co. - Dayton, OH Witnesses: Unknown	Patent Dates: Applied: Jan. 11, 1936 Granted: May 10, 1938 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Master Electric Co.

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