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) monitor Vacuum Tube of John Fleming
Image Scanner Audion of Lee De Forest
Magnetic Tape of Poulsen & Pfleumer Magnetic Drum of Gustav Tauschek
OCR of Gustav Tauschek Tabulating machine of Herman Hollerith
Printed Circuit Board of Paul Eisler Trackball of DATAR
Transistor Integrated Circuit of Jack Kilby and Robert Noyce
Microprocessor Hard Disk
Mouse of Douglas Engelbart DRAM memory of Robert Dennard
Floppy Disk of Yoshiro Nakamatsu Laser Printer of Gary Starkweather
Compact Disc of James Russell Touch Screen
Modem of Dennis Hayes and Dale Heatherington Liquid Crystal Display (LCD)
USB of Ajay Bhatt
From error to error, one discovers the entire truth.
Sigmund Freud