4. Horology: time measuring systems or devices
  5. Time interval
  6. With alternately operating indicators
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Chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Differential timer

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Digital chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Electronic chess clock

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Patent

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Remote pager for chess competition

Horology: time measuring systems or devices – Time interval – With alternately operating indicators
Reexamination Certificate

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