A space-efficient ergonomic telephony keypad is described which comprises three separate groups of four buttons collectively capable of performing twelve distinct electronic switch operations. Each button is formed for tactile operation. Each group has the four buttons positioned about equally around an imaginary central axis. And, each group of four buttons is positionally rotated about 45 degrees relative to the positioning of an adjacent group of four buttons.

 
Web www.patentalert.com

< Time delay compensation device for the management of multimedia communications via an asynchronous network and a telephone network

> Opening and closing device and electronic equipment using the same

~ 00425