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Ralph E. Bartera
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La Canada, CA, US
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last 30 patents
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Patent Grant
Indicator providing continuous indication of the presence of a spec...
Patent number
3,945,801
Issue date
Mar 23, 1976
The United States of America as represented by the United STates National Aer...
James C. Administrator of the National Aeronautics and Space Administration,...
G01 - MEASURING TESTING