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Ionosonde
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Patent number 6,822,574
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Issue date Nov 23, 2004
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National Institute of Information and Communication Technology
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Yoshikatsu Nakamura
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G01 - MEASURING TESTING
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Semi-automatic direction finding set
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Patent number 4,983,983
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Issue date Jan 8, 1991
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The United States of America as represented by the Secretary of the Navy
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William P. Huntley
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G01 - MEASURING TESTING
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Direction finding
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Patent number 4,489,327
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Issue date Dec 18, 1984
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Racal Communications Equipment Limited
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John R. Eastwell
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G01 - MEASURING TESTING
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Signal combining apparatus
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Patent number 4,050,072
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Issue date Sep 20, 1977
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Rockwell International Corporation
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Orville K. Nyhus
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G01 - MEASURING TESTING
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Direction finders
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Patent number 3,965,473
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Issue date Jun 22, 1976
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Anders Edvin Isacson
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G01 - MEASURING TESTING
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3691561
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Patent number 3,691,561
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Issue date Sep 12, 1972
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G01 - MEASURING TESTING
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3534368
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Patent number 3,534,368
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Issue date Oct 13, 1970
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G01 - MEASURING TESTING
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3353184
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Patent number 3,353,184
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Issue date Nov 14, 1967
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G01 - MEASURING TESTING
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2495718
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Patent number 2,495,718
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Issue date Jan 31, 1950
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G01 - MEASURING TESTING
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2485619
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Patent number 2,485,619
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Issue date Oct 25, 1949
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G01 - MEASURING TESTING
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2443529
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Patent number 2,443,529
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Issue date Jun 15, 1948
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G01 - MEASURING TESTING
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2421032
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Patent number 2,421,032
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Issue date May 27, 1947
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G01 - MEASURING TESTING