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ABEL-LOUIS DOIGNON
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ABEL-LOUIS DOIGNON
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Application filed by ABEL-LOUIS DOIGNONfiledCriticalABEL-LOUIS DOIGNON
Application grantedgrantedCritical
Publication of FR403978ApublicationCriticalpatent/FR403978A/fr
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
Landscapes
Physics & Mathematics
(AREA)
Astronomy & Astrophysics
(AREA)
General Physics & Mathematics
(AREA)
Optics & Photonics
(AREA)
FR403978D1909-06-121909-06-12Appareil de visée pour submersibles et sous-marins
ExpiredFR403978A
(fr)