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SE Patent: SE-17,017
Mattsats för precisionsmattagning
Gauge block sets for precision measurement
Patentee:
Carl Edvard Johansson - Eskilstuna, Sweden

USPTO Classifications:

Tool Categories:
metalworking tools : machinist tools : measuring tools

Assignees:
None

Manufacturer:
C. E. Johansson, Inc. - Poughkeepsie, NY
C. E. Johansson AB - Eskilstuna, Sweden

Witnesses:
Unknown

Patent Dates:
Granted: Jan. 30, 1904

Patent Pictures:
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{Wikipedia page for C. E. Johansson
Description:
This is the original patent for "Johansson gauge blocks", which are very precise, flat and smooth blocks that can be "wrung together" so that they stick to one another to form a precise reference for measurement and calibration. Jo blocks are still used today and are only exceeded for accuracy by modern methods such as optical interferometry.

Johansson formed C. E. Johansson AB in 1911 to manufacture his gauge blocks. In 1918 he formed C. E. Johansson, Inc., in Poughkeepsie. In 1923, Henry Ford acquired that company and moved it to Dearborn, At that time Johansson moved to the USA to work directly for Ford. In 1936, at age 72, Johansson retired and moved back to Sweden.

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