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#517182. Lee de Forest, American Inventor
Lee de Forest, 1873-1961, was a Yale University Ph.D, who in 1906 invented the first vacuum tube known as the Audion. It was first used as a detector of radio waves, then as an amplifier, finally as an oscillator for transmitting radio.
Leedeforest.org ~
#517183. Rap promotions
The #1 internet promotions team is back with the newest online promotion tool. Learn the top music promotion techniques and the latest in hip hop news. Rap Promotions will keep you connected to the music industry and the newest trends.
Rap-promotions.info ~
