Charpentier Calculimetre Multidisc Circular SlideRule Brevete S.G.D.G circa 1882
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Around the center is engraved: CALCULIMETRE G. CHARPENTIER; BREVETÉ S.G.D.G. The serial number 11 is engraved below "Charpentier." The back of the instrument bears a scale of equal parts, a logarithmic scale, and an innermost scale of equal parts.
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