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US Patent: 81,611
Grindstone Frame
Patentee:
Joseph W. Douglas - Middletown, Middlesex County, CT

USPTO Classifications:
451/342, 451/406

Tool Categories:
metalworking machines : grinders

Assignees:
W. Douglas - Middletown, Middlesex County, CT
B. Douglas - Middletown, Middlesex County, CT

Manufacturer:
W. & B. Douglas Mfg. Co. - Middletown, Middlesex County, CT

Witnesses:
John M. Douglas
George M. Smith
J. A. Frazier
J. A. Service

Patent Dates:
Granted: Sep. 01, 1868

Patent Pictures: [ 1 | 2 ]
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"Vintage Machinery" entry for W. & B. Douglas Mfg. Co.

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