4 hinged parallel rulers. 19th c 1. Brass, 61... Lot 471
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4 hinged parallel rulers. 19th c 1. Brass, 61 x 9.5 cm. - 2. wood and brass, 61.5 x 9.8 cm. Signed "Hezzanith Mark Field's rule. Hill's patent rule N° 15455". - 3. ebony and brass, 30,5 x 5,7 cm, "London, Reeves & Son". - 4. ivory, 15,5 x 7,3 cm. Signed "Army & Navy C.S.L.".
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