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US Patent: 155,333
Improvement in expansion-bits
Patentee:
William L. Parmelee (exact or similar names) - Seymour, CT

USPTO Classifications:
175/384, 175/40, 408/195, 408/212, D15/139

Tool Categories:
woodworking tools : hand drills : drill bits : adjustable drill bits

Assignees:
None

Manufacturer:
Derby Bit Co. - Ansonia, CT

Witnesses:
Edward Brown
Frank Turkington

Patent Dates:
Applied: Aug. 31, 1874
Granted: Sep. 22, 1874

Patent Pictures: [ 1 | 2 ]
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Description:
An example seen on eBay was in a box labeled, "Derby Expansive Bit Patented These Bits Bore From 7-8 To 3 Inches With One Cutter Manufactured By The Derby Bit Co Ansonia Conn".

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