| 摘要 |
A technique for monitoring the readership of a magazine. Two cards are inserted into the magazine, one toward the front and the other toward the rear. Each card carries a transmitter which is triggered when the magazine is opened to the page it is at. The transmitters emit a signal which is detected and input to a timer. The triggering of the front card actuates the timer, and triggering of the rear card stops the timer. If the time interval recorded by the time between the triggering of the two cards exceeds a predetermined time interval, this is recorded as being indicative of readership.
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