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US Patent: 759,512
Method of Measuring the Revolutions of Rotating Shafts
Patentee:
Hermann Frahm (exact or similar names) - Hamburg-on-the-Elbe, Germany

USPTO Classifications:
33/501, 33/832, 73/506

Tool Categories:
industrial tools : rpm speed gauges and tachometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jul. 24, 1901
Granted: May 10, 1904

Patent Pictures:
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