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US Patent: 1,254,233
Speed Changer
Automatic Speed Changing Attachment for Gear Cutting Machines
Patentee:
James P. Johnson - Cleveland, OH

USPTO Classifications:
409/34

Tool Categories:
industrial machines : industrial machine mechanisms : industrial machine speed changing mechanisms

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Dec. 13, 1916
Granted: Jan. 22, 1918

Patent Pictures:
USPTO pdf tiff
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