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US Patent: 2,026,684
Demonstration apparatus
Patentee:
Carl Edvard Johansson (exact or similar names) - Detroit, MI

USPTO Classifications:
434/187

Tool Categories:

Assignees:
None

Manufacturer:
C. E. Johansson, Inc. - Dearborn, MI

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 18, 1933
Granted: Jan. 07, 1936

Patent Pictures:
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Vintage Machinery entry for C. E. Johansson, Inc.
Description:
For demonstrating "the effect of temperature as causing the expansion or contraction of metals, and to call attention to the necessity, when using gauges for very accurate measurements, of making said measurements under uniform temperature conditions..."

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