A portable radio telephone set provided with a display section includes a rotary selector which turns to select various functions. A menu displayed on the display section is selected by the rotary selector during a non-conversation time, and the sound volume can be adjusted during the conversation time....http://www.google.fr/patents/US5436954?utm_source=gb-gplus-shareBrevet US5436954 - Foldable radio telephone set with rotary selector integral with foldable hinge element
Foldable radio telephone set with rotary selector integral with foldable ...
