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Dual temperature indicator
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Patent number 5,215,378
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Issue date Jun 1, 1993
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Introtech, Inc.
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Wendell J. Manske
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G01 - MEASURING TESTING
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3902368
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Patent number 3,902,368
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Issue date Sep 2, 1975
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G01 - MEASURING TESTING
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3631721
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Patent number 3,631,721
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Issue date Jan 4, 1972
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G01 - MEASURING TESTING