| 摘要 |
PURPOSE:To use a rotary dial telephone set by the same operation as a push- button dial telephone set, by fitting freely attachably and detachably a device, which generates a dial pulse by depression of a key switch, to the rotary dial telephone set provided already. CONSTITUTION:A dial additional device 1 is fitted to a dial surface 3 of a rotary dial telephone set. The dial additional device 1 is provided with key switches corresponding to dial numbers and a dial pulse generating device. When a key switch is depressed, the dial pulse generating device controls turn- on and off of a line switch prescribed number of times to transmit a dial pulse. The telephone set is not remodeled at all by the dial additional device, and the whole of the telephone set becomes small-size because the constitution is simple. |
