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France, Third Republic (1870–1940). Compensated Altimetric Holosteric Barometer manufactured by NAUDET & Cie., 4 Place Torigny, Paris. Marked with the initials “PHBN” (“Perthuis Hulot Bourgeois Naudet”). Made of brass. It comes with its protective brown leather case. 5 x 11 x 13 cm. (Signs of wear and normal use; the flap of the leather case is missing; in fairly good condition). Note: A compensated holo-steric altimeter barometer measures atmospheric pressure and altitude. Often used by civil and military pilots.
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