Photocopy of duplicate patent awarded to Louis-Francois Clém - Lot 67

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Lot n° 67
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Photocopy of duplicate patent awarded to Louis-Francois Clém - Lot 67
Photocopy of duplicate patent awarded to Louis-Francois Clément BREGUET, mentioning research into improvements to electric clocks, dated at the end of the document February 3, 1857.
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