In the main body of a portable telephone apparatus, there are provided an operation section, which contains at least one option key having a communication function other than a dial key or dial function, a speaker for outputting a voice from a remote calling party, and a microphone for receiving and...http://www.google.fr/patents/US5638441?utm_source=gb-gplus-shareBrevet US5638441 - Portable telephone apparatus with rotatable cover allowing enhanced option key access
Portable telephone apparatus with rotatable cover allowing enhanced option ...
