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US Patent: 391,161
Tap
Patentee:
Henrik Kelstad - Minneapolis, MN

USPTO Classifications:
408/156

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
R. H. Sanford
C. L. Nachtrieb

Patent Dates:
Applied: Jun. 29, 1888
Granted: Oct. 16, 1888

Patent Pictures:
USPTO pdf tiff
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Description:
Tap with adjustable diameter of cut due to split construction and a set screw.

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