1
Sumio Nishiyama: Method of using ten-key keypad. Pioneer Corporation, Arent Fox Kintner Plotkin & Kahn Pllc, February 27, 2003: US20030038787-A1 (9 worldwide citation)

A ten-key keypad for inputting numerals mounted on a portable telephone T is adapted to a zoom function and a scroll function for operating an image displayed on a display. The user can use the keys of the ten-key keypad to select the mode in which case the keys also serve as image operation keys.


2
Sumio Nishiyama: Method of using ten-key keypad. Pioneer Corporation, Increment P Corporation, Arent Fox PLLC, March 28, 2006: US07019731 (3 worldwide citation)

A ten-key keypad for inputting numerals mounted on a portable telephone T is adapted to a zoom function and a scroll function for operating an image displayed on a display. The user can use the keys of the ten-key keypad to select the mode in which case the keys also serve as image operation keys.