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US Patent: 2,148,765
Mass and form vibrator
Patentee: Arthur William Mall (exact or similar names) - Chicago, IL USPTO Classifications: 366/122, 366/123, 366/128 Tool Categories: Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Apr. 25, 1935 Granted: Feb. 28, 1939 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Mall Tool Co.

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