The mechanicanical & acoustical characteristics of a UPT DTMF access device which is accoustically coupled to the microphone of a handset telephony terminal.
- Edition:
- 1
- Published:
- 03/01/1995
- Number of Pages:
- 13
- File Size:
- 1 file , 61 KB
- Note:
- This product is unavailable in Russia, Ukraine, Belarus
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