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Range limiting system
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Patent number 4,999,636
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Issue date Mar 12, 1991
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Amtech Technology Corporation
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Jeremy A. Landt
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G01 - MEASURING TESTING
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Signal discrimination system
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Patent number 4,888,591
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Issue date Dec 19, 1989
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Amtech Technology Corporation
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Jeremy A. Landt
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G01 - MEASURING TESTING
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Interrogation, and detection system
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Patent number 4,075,632
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Issue date Feb 21, 1978
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The United States of America as represented by the United States Department o...
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Howard A. Baldwin
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A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE