4. Communications: radio wave antennas
  5. Antennas
  6. Balanced doublet - centerfed

Robert R. Hellman

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Dual acting snap switch

Electricity: circuit makers and breakers – Special application – Liquid or moisture responsive
Patent

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Radio transmitter with intermixed controls

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent

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Remote control radio system

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent

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Remote control radio system

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent

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Switch for sensing a selected ratio between two different pressu

Electricity: circuit makers and breakers – Fluid pressure – Diaphragm
Patent

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Profile ID: LFUS-PAI-P-133028

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