US Patent: 270,977
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Auger
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Manufacturer: |
Not known to have been produced |
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Patent Dates:
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Applied: |
Oct. 24, 1882 |
Granted: |
Jan. 23, 1883 |
USPTO (New site tip) Google Patents
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Jeff Joslin (dm)
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Description: |
Essentially a revisit of his earlier patent (75454), this is another approach to increasing the mass/strength of the working end of the bit. |
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