| 摘要 |
The apparatus includes a master telephone for displaying a received DTMF tone; a exchange station for connecting the master telephone to a plurality of slave telephones; an N slave telephones for off-hooking the DTMF tone from the master telephone and for transmitting/receiving the data to/from a vending machine; and a plurality of vending machines for transmitting/receiving the data to/from the plurality of slave telephones, each of the plurality of vending machines having each original number.
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