1949
•  45-RPM records invented.
•  The first three-speed phonographs marketed.
•  The first pagers announced.
•  The first consumer stereo tape recorders launch.
•  First direct-dialed long distance telephone call made.

1948
•  33-RPM vinyl LP records introduced.
•  The first magnetic tape recorders sold in the United States by Ampex Corp.
•  Gone With the Wind" transmitted electronically to the Library of Congress in less than 2.5 minutes.
•  TV set sales increase more than 500 percent compared to 1947 sales.
•  The first cable TV systems in the United States developed.
•  First Citizen's Band radios debut.
•  The basic concepts of digital communication unveiled.
•  First computer to use stored programs built.

1947
•  William Shockley, Hohn Bardeen and Walter Brattain invent the transistor at Bell Telephone Laboratories.

1946
•  The first mobile telephone service initiated.
•  The first electronic computer, ENIAC, demonstrated.
•  John Mullin demonstrates improved German-made Magnetophon magnetic tape recorders for a U.S. engineering convention.
•  The FCC allocates Citizen’s Band Radio frequencies.

1945
•  Unlimited output of radios and televisions permitted after the end of World War II.
•  Arthur C. Clarke proposes a geosynchronous communications satellite system, an area in space where these satellites orbit. Twenty years later it dubbed the "Clarke Belt" in his honor.
•  Grace Murray Hopper coins the term "bug" to describe a computer fault.

1942
•  TV equipment production banned during World War II.
•  The first all-electronic digital computer completed.
•  First stereo tape recordings made.

1941
•  Commercial FM operation begins.
•  The FCC adopts the NTSC standard and TV broadcasts begin.
•  First Touchtone telephone call completed.

1940
•  The first color TV broadcast airs.