Gruen Patent Pinion
The date of founding of the Gruen enterprises was calculated from the date of his Pinion patent that appears on early Columbus Watch Co. watches.
This is an example with a private label for a jeweler in Michigan.
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Gruen Patent Pinion
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Gruen Patent Pinion The date of founding of the Gruen enterprises was calculated from the date of his Pinion patent that appears on early Columbus Watch Co. watches. This is an example with a private label for a jeweler in Michigan.
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