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US Patent: 87,796
Improvement in auger-bits
Double-twist auger
Patentee:
Henry L. Shailer - Deep River, CT

USPTO Classifications:
408/213

Tool Categories:
metalworking machines : drilling and boring : drill bits
woodworking tools : hand drills : drill bits

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
T. C. Silliman
Gideon Parker

Patent Dates:
Granted: Mar. 16, 1869

Patent Pictures:
USPTO pdf tiff
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Description:
Shailer was the son-in-law of Russell Jennings. In 1879 he bought Ezra L'Hommedieu's operations in nearby Chester, CT, and ran them for a couple of years before selling them to Jennings.

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