4. Communications: electrical
  5. Audible indication
  6. Percussion-type sound producer

Russell H. Romney

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Changeable display apparatus

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Comprehensive information display system

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Explosive booster casing

Ammunition and explosives – Igniting devices and systems
Patent

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Information display system

Communications: electrical – Audible indication – Percussion-type sound producer
Patent

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Profile ID: LFUS-PAI-P-683002

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