Articles:
SOUND RECORDINGS
1.
Noise generator (USSR 1948-1976; Bulgaria, Czechoslovakia
1951-1988;
Vietnam - currently in use) 
2. Radio program, transmitted in FM mode and heard distorted in
AM mode (USSR 1964-1988, China)
3. Speech-like signal (USSR 1976-1988, USSR/Poland
1980-1988)
4. Swinging carrier, or "wobler" (Cuba, Iran -
currently in use)
5. Music (USSR/Poland, 1971-1980)
6. Music (China, in use since 2001)
- in Czech
Archive documents:
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