US Patent: 2,026,684
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| Demonstration apparatus
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Patentee:
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| Carl Edvard Johansson (exact or similar names) - Detroit, MI |
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Patent Dates:
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| Applied: |
Oct. 18, 1933 |
| Granted: |
Jan. 07, 1936 |
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Jeff Joslin
Vintage Machinery entry for C. E. Johansson, Inc.
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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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