US Patent: 287,538
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Bit Threaded Spur Auger Bit
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Patentee:
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Edward Hall (exact or similar names) - Elkhart, IN |
Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Applied: |
Aug. 25, 1883 |
Granted: |
Oct. 30, 1883 |
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Jeff Joslin (dm)
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Description: |
The spurs of this bit are threaded to help feed the bit into the work, especially toward the end of the cut as the lead screw loses its traction. |
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