French-pattern Folding Sector by Claude Langlois
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French-pattern Folding Sector by Claude Langlois, Paris, mid-18th century, signed Langlois Paris aux Galleries du Louvre, with engraved foliage on the hinge, and scales for Equal Parts, Solids, Diameter and Weights of Cannonballs, and others, lg. 7 in. (closed).