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Ceramic tamper-revealing seals
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Patent number 5,169,188
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Issue date Dec 8, 1992
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The United States of America as represented by the United States Department o...
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David S. Kupperman
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B28 - WORKING CEMENT, CLAY, OR STONE
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Ultrasonic shear wave couplant
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Patent number 4,559,827
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Issue date Dec 24, 1985
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The United States of America as represented by the United States Department o...
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David S. Kupperman
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G01 - MEASURING TESTING
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Scanning ultrasonic probe
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Patent number 4,361,044
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Issue date Nov 30, 1982
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The United States of America as represented by the United States Department o...
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David S. Kupperman
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G01 - MEASURING TESTING