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Radio Record, Volume VIII, Issue 32, 15 February 1935, Page 29

"[NTERVAL SIGNALS." which are a feature of European programmes, & cuckoo cuckooing between numbers, or a repeated musical figure, and which serve to identify the stations, are unknown in America, where. the N.B.C. has just decided to tighten up its intervals even more, allowing no more than nine seconds’ break in any programme; the idea is to quicken the pace, and maintain listeners’ interest. .