Search results
Results from the WOW.Com Content Network
Charles Robert Schwab Sr. (born July 29, 1937) is an American investor and financial executive. The founder and chairman of the Charles Schwab Corporation, he pioneered discount sales of equity securities starting in 1975. His company became by far the largest discount securities dealer in the United States.
The invention of the superheterodyne receiver solved this problem, and the first radios with a heterodyne radio receiver went for sale in 1924. But it was costly, and the technology was shelved while waiting for the technology to mature, and in 1929 the Radiola 66 and Radiola 67 went for sale.
The next year the company used the same concept to begin establishing the first radio network. [107] The WEAF and WJZ chains. At the same time in early 1922 that it announced the beginning of advertisement-supported broadcasting, AT&T also introduced its plans for the development of the first radio network. [104]
1920s: Radio was first used to transmit pictures visible as television. 1926: Official Egyptian decree to regulate radio transmission stations and radio receivers. [40] Early 1930s: Single sideband (SSB) and frequency modulation (FM) were invented by amateur radio operators. By 1940, they were established commercial modes.
Before the discovery of electromagnetic waves and the development of radio communication, there were many wireless telegraph systems proposed and tested. [4] In April 1872 William Henry Ward received U.S. patent 126,356 for a wireless telegraphy system where he theorized that convection currents in the atmosphere could carry signals like a telegraph wire. [5]
The first compact discs were stamped off the production line on August 17, 1982. Since then, 200 billion CDs have been produced — 194 billion accounted for by AOL signup disks, according to Wired .
Milestones in radio: the first half century (1895–1945). The UNESCO courier (February 1997), p. 16–21; Radio Review/Radio Listeners Guide (1925–1929), Broadcasting Yearbook (1935–2010), World Radio TV Handbook (1947–) Berg, Jerome S. The early shortwave stations: a broadcasting history through 1945 (2013) radioheritage.net
There, Wavering and Lear together developed the first commercially successful car radio calling it the Motorola. [4] [5] Wavering and Galvin traveled around the country selling radios and teaching new dealers how to install them. [7] In 1932, Paul Galvin selected Wavering to lead Motorola's car radio and police two-way communications businesses.