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Perpetual calendar clock

Horology: time measuring systems or devices – With calendar indicator – Movable drum
Reexamination Certificate

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Perpetual calendar for a timepiece

Horology: time measuring systems or devices – With calendar indicator – Movable ring or disk
Reexamination Certificate

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Perpetual calendar mechanism comprising a four year cycle indica

Horology: time measuring systems or devices – With calendar indicator – Movable ring or disk
Patent

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Perpetual calendar structure

Horology: time measuring systems or devices – With calendar indicator – Movable drum
Patent

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Perpetual calendar watch having two motors

Horology: time measuring systems or devices – With calendar indicator
Patent

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Perpetual calendar watch with analog time display

Horology: time measuring systems or devices – With calendar indicator
Patent

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Perpetual day reminder calendar

Horology: time measuring systems or devices – With calendar indicator
Reexamination Certificate

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Perpetual day reminder calendar

Horology: time measuring systems or devices – With calendar indicator
Reexamination Certificate

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Personal organization tool

Horology: time measuring systems or devices – With calendar indicator
Reexamination Certificate

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Planetary gear for date mechanism in a wristwatch

Horology: time measuring systems or devices – With calendar indicator – Movable ring or disk
Patent

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Postage meter having non-Gregorian calendar capability

Horology: time measuring systems or devices – With calendar indicator
Reexamination Certificate

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