FR402467A - Dispositif au moyen duquel des objets peuvent etre vus ou photographiés de l'intérieur de sous-marins ou d'emplacements analogues
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Dispositif au moyen duquel des objets peuvent etre vus ou photographiés de l'intérieur de sous-marins ou d'emplacements analogues
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G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
G02B23/08—Periscopes
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General Physics & Mathematics
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Optics & Photonics
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FR402467D1908-07-171909-04-27Dispositif au moyen duquel des objets peuvent etre vus ou photographiés de l'intérieur de sous-marins ou d'emplacements analogues
ExpiredFR402467A
(fr)