4. Education and demonstration
  5. Telling time or calendar reading

Pui Yan Chan

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Apparatus, method and system for teaching elapsed time

Education and demonstration – Telling time or calendar reading
Reexamination Certificate

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Apparatus, method and system for teaching elapsed time

Horology: time measuring systems or devices – Chronological – With mechanical or electromechanical driven display
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2964216

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