| 摘要 |
A telephone attachment is provided for fitting over the keyboard of a pushbutton telephone for converting from the telephone pushbutton format to a calculator pushbutton format. The attachment design includes a plurality of u-shaped levers in contact with several attachment-mounted pushbuttons arranged in a calculator format. The individual levers are so disposed within the attachment that they depress correspondingly-numbered telephone pushbuttons when the calculator format pushbuttons are depressed. Through the use of the attachment, a telephone user operates a pushbutton telephone using the calculator pushbutton format.
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