47 CFR § 73.4275
Tone clusters; audio attention-getting devices
February 16, 2021
See Public Notice, FCC 76-610, dated July 2, 1976. 60 FCC 2d 920; 41 FR 28582, July 12, 1976.
[44 FR 36389, June 22, 1979]
See Public Notice, FCC 76-610, dated July 2, 1976. 60 FCC 2d 920; 41 FR 28582, July 12, 1976.
[44 FR 36389, June 22, 1979]