Inventor

ZIELKE ALFRED

3 patents

Patents

3 patents

US4140883AFeb 20, 1979

Keyboard with selective key entry block

ELMEG4 citations54

US4210787AJul 1, 1980

Keyboard construction

ELMEG1 citations44

US4167657ASep 11, 1979

Keyboard with mechanical encoding

ELMEG1 citations44