4. Recording, communication, or information retrieval equipment
  5. Computer, data processor equipment

David M. Britz

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Calling card telephone

Recording – communication – or information retrieval equipment – Computer – data processor equipment
Patent

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Conference microphone

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Element or attachment
Patent

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Free space duplexed optical communication with transmitter...

Optical waveguides – With optical coupler – Plural
Reexamination Certificate

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Free space duplexed optical communication with transmitter...

Optical waveguides – Optical fiber waveguide with cladding – With graded index core or cladding
Reexamination Certificate

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Free space optical communication link with diversity

Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate

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Profile ID: LFUS-PAI-P-681362

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