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Visual aid for VLF MSK signals
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Patent number 5,144,643
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Issue date Sep 1, 1992
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The United States of America as represented by the Secretary of the Navy
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Lynn K. Thomas
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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400 Hertz harmonic generator
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Patent number 4,882,551
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Issue date Nov 21, 1989
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The United States of America as represented by the Secretary of the Navy
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Paul A. Singer
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H03 - BASIC ELECTRONIC CIRCUITRY
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Programmable time varying attenuator
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Patent number 4,625,332
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Issue date Nov 25, 1986
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The United States of America as represented by the Secretary of the Navy
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Paul A. Singer
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G01 - MEASURING TESTING
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Simulated VLF/LF noise generator
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Patent number 4,173,000
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Issue date Oct 30, 1979
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The United States of America as represented by the Secretary of the Navy
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Paul A. Singer
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H03 - BASIC ELECTRONIC CIRCUITRY