4. Telecommunications
  5. Carrier wave repeater or relay system
  6. Two separate way transmission

E.F. Johnson Company

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Bandwidth management system for a remote repeater network

Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via frequency channels
Patent

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Battery charger

Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent

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Control head with electroluminescent panel for a land mobile...

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Radio transceiver
Design Patent

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Handheld two-way radio with hinged cover

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Radio transceiver
Patent

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Method and system for peer-to-peer communication among sites

Multiplex communications – Communication over free space – Message addressed to multiple destinations
Reexamination Certificate

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