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Adjustable time delay circuit
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Patent number 4,618,787
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Issue date Oct 21, 1986
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AT&T Teletype Corporation
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Barry H. Jacksier
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H03 - BASIC ELECTRONIC CIRCUITRY
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Receiver for digital signals
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Patent number 4,575,859
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Issue date Mar 11, 1986
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AT&T Teletype Corporation
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Gary B. Ollendick
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H03 - BASIC ELECTRONIC CIRCUITRY
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Digital voltage comparator
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Patent number 4,358,690
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Issue date Nov 9, 1982
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Teletype Corporation
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Gary B. Ollendick
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H03 - BASIC ELECTRONIC CIRCUITRY
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Gray tone generation
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Patent number 3,977,007
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Issue date Aug 24, 1976
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Teletype Corporation
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James M. Berry
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS