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US Patent: 195,902
Improvement in machines for smoothing ivory key-boards
Patentee:
Milon Pratt (exact or similar names) - Deep River, CT

USPTO Classifications:
144/118

Tool Categories:
trade specific : music instrument maker

Assignees:
Pratt, Read & Co. - Deep River, CT

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: May 21, 1875
Granted: Oct. 09, 1877

Patent Pictures:
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