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US Patent: 639,539
Automatic-operating air-compressor
Patentee: George E. Drum (exact or similar names) - Philadelphia, PA USPTO Classifications: 417/223 Tool Categories: industrial machines : pneumatic : air compressors Assignees: George E. Drum - Philadelphia, PA Robert P. Smith - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: E. P. Klinger John Shinn	Patent Dates: Applied: Nov. 01, 1898 Granted: Dec. 19, 1899 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Smith, Drum & Co.

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