who invented the digital numbers you see on old casio watches and alarm clocks?

Answer 1

you mean those old paper numbers on wheels? good cosetion.

Answer 2

"Seven segment displays can be found in patents as early as 1908, but did not achieve widespread use until the advent of LEDs in the 1970s."
http://en.wikipedia.org/wiki/Seven-segment_display

LEDs: Texas Instruments (Radio Shack)
"Rubin Braunstein of the Radio Corporation of America first reported on infrared emission from gallium arsenide (GaAs) and other semiconductor alloys in 1955. Experimenters at Texas Instruments, Bob Biard and Gary Pittman, found in 1961 that gallium arsenide gave off infrared (invisible) light when electric current was applied. Biard and Pittman were able to establish the priority of their work and received the patent for the infrared light-emitting diode. Nick Holonyak Jr. of the General Electric Company developed the first practical visible-spectrum LED in 1962. Holonyak's former graduate student, Dr. M. George Craford, invented in 1972 the first yellow LED and 10x brighter red and red-orange LEDs."
http://en.wikipedia.org/wiki/Light_emitting_diode

Answer 3

Roger Riehl's Synchronar Mark 1 was the first to have an LED display. The display style could be much older, however.

Answer 4

I think Motorola and Monsanto were first to come out with 7 segment LEDs

Answer 5

alfred hitchclock