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US Patent: 639,539
Automatic-operating air-compressor
Patentee:
George E. Drum - Philadelphia, PA

USPTO Classifications:
417/223

Tool Categories:
industrial machines : pneumatic : air compressors

Assignees:
Robert P. Smith - Philadelphia, PA
George E. Drum - Philadelphia, PA

Manufacturer:
Not known to have been produced

Witnesses:
John Shinn
E. P. Klinger

Patent Dates:
Applied: Nov. 01, 1898
Granted: Dec. 19, 1899

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Smith, Drum & Co.

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