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High frequency Morse code transmission
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Patent number 11,018,902
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Issue date May 25, 2021
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International Business Machines Corporation
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Pravin Kailashnath Kedia
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Through metal communication system
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Patent number 8,866,648
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Issue date Oct 21, 2014
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King Fahd University of Petroleum & Minerals
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Samir Mekid
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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Printer
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Patent number 4,590,330
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Issue date May 20, 1986
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Alps Electric Co., Ltd.
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Takashi Goto
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B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
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Patent number 3,928,721
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Issue date Dec 23, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3786494
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Patent number 3,786,494
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Issue date Jan 15, 1974
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H04 - ELECTRIC COMMUNICATION TECHNIQUE