| 摘要 |
A system for checking the operable conditions of one or more pieces of electrical equipment from a remote position includes an individual oscillator associated with each of the pieces of equipment to be checked. Switches which are responsive to the condition of the equipment are provided to connect the individual oscillators to a switching means. The switching means is operatively responsive to a call signal from a telephone line for effecting the coupling of signals from the oscillators to a telephone line. A timing circuit is provided to disconnect the oscillators from the telephone line after a given period of time expires. Each oscillator has a different distinctive output signal characteristic.
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