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However, as will be more particularly set forth later, it is pertinent to synchronize timed data within the nationwide system, even taking into account differences in travel time of radio waves (see U.S. Pat. No. 4,591,906), and for this reason the technique described in Pat. No. 4,755,871, Jul. 5, 1988 for Control of RF Answer Pulses in a TV Answer Back System may be used to synchronize transmiss
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