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US20070243002 Interconvertible structure of alphabetic-numeric keyboard  
An interconvertible structure of alphabetic-numeric keyboard provided comprises of four lines of keys, wherein keys of the second, third and fourth are movable horizontally; a movable sheet is...
US20110052296 KEYBOARD  
A keyboard having an arrangement of English letters and Japanese Kana (Hiragana) characters across keys of the keyboard. The keys are associated with more than two letters and/or characters. The...
Matches 1 - 2 out of 2