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Two-way ranging system
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Patent number 4,677,441
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Issue date Jun 30, 1987
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International Standard Electric Corporation
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Gunter Hofgen
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G01 - MEASURING TESTING
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Position-fixing system
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Patent number 4,613,864
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Issue date Sep 23, 1986
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International Standard Electric Corporation
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Gunter Hofgen
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G01 - MEASURING TESTING
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Two-way ranging system
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Patent number 4,438,435
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Issue date Mar 20, 1984
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International Standard Electric Corporation
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Gunter Hofgen
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G01 - MEASURING TESTING
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Airport surveillance system
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Patent number 4,418,349
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Issue date Nov 29, 1983
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International Standard Electric Corporation
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Gunter Hofgen
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G01 - MEASURING TESTING
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Radio navigation system
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Patent number 4,197,542
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Issue date Apr 8, 1980
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International Standard Electric Corporation
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Gunter Hofgen
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G01 - MEASURING TESTING