Markings for telephone key-pad dialler - are provided on clear film held over assigned positions by retaining frame

摘要

A keypad, for telephone dialling and signalling applications has a flexible foil pulled over the keys to cover the markings appropriate to each key. Consequently, the individual keys are not engraved and the markings can be easily changed. The keypad (TF) has a marker foil (BF) pulled over the top of it and retained by a frame (R) which has four corner pins (Z) to locate in holes (L) at the corners of the keypad (TF) on the equipment itself. The foil (BF) is a clear material which is easily changed.