The bases of digital computers

The modern computer is a product of many technologies, developed in 19th and 20th centuries. Who are the people and companies, who made it possible?

Computer Keyboard (typewriter)Electromechanical Relay of Joseph Henry
Cathode Ray Tube (CRT) monitorVacuum Tube of John Fleming
Image ScannerAudion of Lee De Forest
Magnetic Tape of Poulsen & PfleumerMagnetic Drum of Gustav Tauschek
OCR of Gustav TauschekTabulating machine of Herman Hollerith
Printed Circuit Board of Paul EislerTrackball of DATAR
TransistorIntegrated Circuit of Jack Kilby and Robert Noyce
MicroprocessorHard Disk
Mouse of Douglas EngelbartDRAM memory of Robert Dennard
Floppy Disk of Yoshiro NakamatsuLaser Printer of Gary Starkweather
Compact Disc of James RussellTouch Screen
Modem of Dennis Hayes and Dale HeatheringtonLiquid Crystal Display (LCD)
USB of Ajay Bhatt

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