4. Telephonic communications
  5. Audio message storage, retrieval, or synthesis
  6. Dynamic audio signal recording or reproduction

Leon Ferber

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Apparatus for increasing catalytic efficiency

Chemical apparatus and process disinfecting – deodorizing – preser – Chemical reactor – Including solid – extended surface – fluid contact reaction...
Patent

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Automatic screening apparatus and method for use with telephone

Telephonic communications – Audio message storage – retrieval – or synthesis – Dynamic audio signal recording or reproduction
Patent

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Method and apparatus for increasing catalytic efficiency of elec

Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent

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Profile ID: LFUS-PAI-P-632894

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