CFR /  Title 47  /  Part 73  /  Sec. 73.4275 Tone clusters; audio attention-getting devices.

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]