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US4300236A
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Radio signalling systems
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CH614796A5
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System for the wireless transmission of signals and the use of the system in a monitoring system
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ES456960A1
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Improvements in radio signaling systems. (Machine-translation by Google Translate, not legally binding)
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CA1094164A
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Radio signalling systems
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US4162448A
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Radio signalling systems
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IT1082179B
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Radio communication system using personal transmitters - uses pulse pattern on common frequency to identify caller
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ATA172277A
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System for transmitting information using a modulable carrier shaft
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DE2710499A1
|
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Radio communication system using personal transmitters - uses pulse pattern on common frequency to identify caller
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NL7702622A
|
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Radio communication system using personal transmitters - uses pulse pattern on common frequency to identify caller
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ZA7701355B
|
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Radio signalling systems
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GB1414119A
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Security system for responding to the movement of individuals
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