Universal Personal Telecommunication (UPT). Access devices. Dual Tone Multi Frequency (DTMF) sender for acoustical coupling to the microphone of a handset telephone
German title
UNIVERSELLE PERSOENLICHE TELEKOMMUNIKATION (UPT). ANSCHLUSSGERAETE. ZWEITON-MULTIFREQUENZSENDER FUER DIE AKUSTISCHE KOPPLUNG AN DAS MIKROPHON EINES TELEFONS MIT HANDAPPARAT
Publication date
1998-04-01
Original language
French
Pages
12
Publication date
1998-04-01
Original language
French
Pages
12
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