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US Patent: D6,764
Design for frame of bolt-threading machines
Patentee:
Salmon W. Putnam, Jr. - Fitchburg, MA

USPTO Classifications:
D15/141

Tool Categories:
metalworking machines : metal threading machines

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
J. R. Snow
R. H. Eddy
S. W. Piper
L. N. Miller

Patent Dates:
Applied: Jan. 24, 1873
Granted: Jul. 08, 1873

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for Putnam Machine Co.

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