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Navigation system
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Patent number 4,454,583
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Issue date Jun 12, 1984
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Signal Scanning Products, Inc.
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Edward M. Schneiderhan
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G01 - MEASURING TESTING
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3842420
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Patent number 3,842,420
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Issue date Oct 15, 1974
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G01 - MEASURING TESTING
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3798649
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Patent number 3,798,649
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Issue date Mar 19, 1974
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G01 - MEASURING TESTING
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3312973
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Patent number 3,312,973
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Issue date Apr 4, 1967
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G01 - MEASURING TESTING