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US Patent: 1,991,854
Apparatus for demonstrating the adhesion of flat surfaces
Patentee:
Carl Edvard Johansson - Detroit, MI

USPTO Classifications:
434/365, 73/150A, 73/808, 73/826

Tool Categories:
metalworking tools : machinist tools : measuring tools

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 13, 1933
Granted: Feb. 19, 1935

Patent Pictures:
USPTO pdf tiff
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Description:
"This invention relates to improvements in apparatus for demonstrating the adhesion of flat surfaces, such as the accurately finished surfaces of 'Johansson gauges'." Johannson gauge blocks, or Jo blocks, were not patented in the US as they were patented long before Johansson moved from Sweden to Detroit.

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