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Publication of NL6605964ApublicationCriticalpatent/NL6605964A/xx
G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
G02B23/24—Instruments or systems for viewing the inside of hollow bodies, e.g. fibrescopes
G02B23/2476—Non-optical details, e.g. housings, mountings, supports
G02B23/2492—Arrangements for use in a hostile environment, e.g. a very hot, cold or radioactive environment