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US Patent: 2,026,684
Demonstration apparatus
Patentee:
Carl Edvard Johansson - Detroit, MI

USPTO Classifications:
434/187

Tool Categories:

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

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

Patent Pictures:
USPTO pdf tiff
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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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