4. Horology: time measuring systems or devices
  5. Time interval
  6. Gravity actuated type
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Hourglass construction

Horology: time measuring systems or devices – Time interval – Gravity actuated type
Patent

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Hourglass novelty apparatus having unequal chamber volumes

Horology: time measuring systems or devices – Time interval – Gravity actuated type
Patent

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Hourglass with bypass duct

Horology: time measuring systems or devices – Time interval – Gravity actuated type
Reexamination Certificate

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