Method and device for the optical detection of defective points on the inner walls of long hollow bodies
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Rifle scope for short observation distances
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Optical probe for examining and taking photographs of long hollow bodies
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Film projector with film moving continuously through the image window
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Drive of film projectors for demonstrations with different numbers of images per second with correspondingly different numbers of diaphragm blades
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Process to achieve the greatest possible light output in projection devices and the like. like
FR1107443A
Device for photographic recording of the inner surface of hollow bodies
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Camera for photographing the inner surface of a hollow body
GB751694A
Improvements in or relating to arrangements for photographically exploring the interior of hollow bodies
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Process for fitting, overlapping or butt jointing of unperforated image strips, in particular photographic film strips
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Device for the photographic registration of the inner surface of hollow bodies
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Device for the intermittent switching of oversized, unperforated films
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Movie projector
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Illuminated film gluing press
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Method for observing objects or optical images moving on a straight or curved path at the same or alternating speed by means of rotating wedges made of refractive material
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Double acting beater drive
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Orientation map
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Light shield
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Circuit for pantographs in electrically operated vehicles
