Note 1: Amateur radio licensing began in 1912 and
required 5 WPM code. The Bureau of Navigation, a division of the
Department of Commerce, regulated United States radio until the
1927 formation of the Federal Radio Commission. In 1934 the
Federal Communications Commission succeeded the FRC.
Note 2: Amateur Radio was shut down
for the duration of World War I and the Department of Commerce
cancelled all amateur licenses. Consequently hams lost their
call signs that were issued just a few years earlier. After the
war amateurs were relicensed with new call signs rather than
their previously held call signs.
Note 3: Amateur
Radio was shut down on December 7, 1941 because of WWII as it
was in other countries of the world for the duration of the