4. Communications: electrical
  5. Systems
  6. Timer control

Natan Epstein

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Abuse resistant doorbells

Communications: electrical – Systems – Timer control
Reexamination Certificate

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Method for controlling abusive use of doorbells

Communications: electrical – Systems – Timer control
Reexamination Certificate

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Wireless messaging system

Telecommunications – Radiotelephone system – Message storage or retrieval
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2870609

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