| http://www.w3.org/ns/prov#value | - In the system for monitoring station-originated broadcasts 4, the source is a film or videotape playback unit. (In this case, of course, the tuner portion of the receiver 52 is unnecessary.) The function of the program-change detector 60 in the registration unit 22 is simply to enable the computer 62 to measure the precise duration of each program, i.e., the time between detection of program-start
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