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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.de:Appstore for Android
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DTMF encoder decoder DTMF tone generator 30 einmal zu empfangen serielle daten|generator|generator tone - AliExpress
GitHub - zeyus/Python3BlueBox: The most modern way to live in the 70s, 80s, and 90s, a phreaking awesome Blue Box DTMF tone generator
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