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Gilbert & Sons / London
William Gilbert and SonsEnglandIvory and Brass6 inc. 1810

Notes: "Unusual brass hinge on this sector similar to hinge design on Coggeshall rule with brass bolsters. In addition to typical sector scales, there are additional scales on one side including: LnMe (longitude meridians), Cho (chords), Lat (latitude), Hou (hours)."

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