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Remote control transmitter
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Patent number 4,208,654
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Issue date Jun 17, 1980
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Preh, Electrofeinmechanische Werke, Jakob Preh Nachf GmbH & Co.
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Alfred Vogt
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G08 - SIGNALLING
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Remote control receiver
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Patent number 4,198,620
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Issue date Apr 15, 1980
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Preh, Elektrofeinmechanische Werke, Jakob Preh Nachf GmbH & Co.
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Alfred Vogt
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G08 - SIGNALLING