US Patent: 669,251
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Saw-sharpening machine
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Patentees:
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Henry P. Schofield (exact or similar names) - Chicago, IL |
Lars Larsen Filstrup (exact or similar names) - Chicago, IL |
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Patent Dates:
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Applied: |
Dec. 03, 1900 |
Granted: |
Mar. 05, 1901 |
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Jeff Joslin Vintage Machinery entry for Covel Mfg. Co.
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Description: |
In 1905 the Seventh Circuit Court of Appeals found patent 654,843, 654,844, 654,845, and 669,251, "void for lack of patentable invention in view of the prior art, in which the same devices were found in use in saw-swaging machines." |
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