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Chord Keyboard
Bellaire Electronics
CyKey
Depraz
Swiss Mouse
Frog Pad, Inc.
FrogPad
HandKey (TekGear)
Twiddler
Infogrip
Bat
Microwriter
AgendA
Microwriter
Microwriter
NewO Company
Writehander
Xerox PARC
PARC 5-key Chord Keyboard
Xerox PARC
PARCtab