4. Horology: time measuring systems or devices
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Electronic calculation watch with digital display

Horology: time measuring systems or devices – Astronomical
Patent

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Electronic digital display watch having solar and geographical f

Horology: time measuring systems or devices – Astronomical – With sun and earth display
Patent

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Electronic sundial apparatus

Horology: time measuring systems or devices – Astronomical
Patent

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Electronic tide meter, method for calculating a high/low...

Horology: time measuring systems or devices – Astronomical – With tide display
Reexamination Certificate

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