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US Patent: 1,731,954
Calipers
Patentee:
Emil J. Tjurnlund (exact or similar names) - St. Paul, MN

USPTO Classifications:
33/558.01

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Reiner and Campbell - St. Paul, MN

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 12, 1927
Granted: Oct. 15, 1929

Patent Pictures: [ 1 | 2 ]
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Description:
This set of calipers uses an unusual "collar" locking mechanism for the legs, as well as a very interesting micro-adjust feature on one point.

Known examples are marked with the patent number as well as "Reiner and Campbell Quickset". The production tools do not have the micro-adjust feature.

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