| 摘要 |
Vending and recording apparatus comprising one or more vending machines, a central recording station, signal generator including a radio frequency carrier generator generating a range of radio frequency capable of affording a number of spaced carrier channels of which at least one individual channel is allocated to each of the machines, circuitry for modulating said carrier channels with trains of pay pulses representing cost units indicative of the value of a dispensed article to obtain, when an article is dispensed from the vending machine modulated carrier radio frequency signals capable of being transmitted over a physical transmission line between said central station and said machine, and at said central station circuitry demodulating and amplifying said carrier frequency signals and recording and indicating a signal output representing the value of the dispensed article.
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