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GB592144A
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Improvements in and relating to objectives suitable for photographic purposes
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GB568590A
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Improvements relating to the mounting of lenses or other optical elements
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|
GB551479A
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Improvements relating to the mounting of optical devices
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|
GB535480A
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Improvements in or relating to objectives suitable for photographic and like purposes
|
|
GB507590A
|
|
Improvements in or relating to objectives suitable for photographic purposes
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GB472191A
|
|
Improvements in and relating to objectives suitable for photographic purposes
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|
GB425383A
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Improvements in optical apparatus suitable for telescopic sighting devices
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|
GB422270A
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Improvements in or relating to telescopic sights, especially for rifles
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|
GB333576A
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Improvements in and relating to fire traps for cinematograph projection apparatus
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GB323138A
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Improvements in and relating to objectives suitable for photographic purposes
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|
DE495482C
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|
Interferometer for testing optical elements
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GB309749A
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|
Improvements in and relating to telescopes, sighting devices and so forth
|
|
GB308503A
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Improvements in and relating to optical systems suitable for telescopes
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|
GB301672A
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|
Improvements in and relating to prismatic systems suitable for telescopes
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GB305350A
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|
Improvements in and relating to interferometers for the testing of optical elements
|
|
GB295519A
|
|
Improvements in and relating to objectives suitable for photographic purposes
|
|
GB213994A
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|
Improvements in and relating to arc lamps suitable for cinematographic purposes
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GB197707A
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Improvements in apparatus for exhibiting cinematographic pictures
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GB195028A
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Improvements in apparatus for exhibiting cinematographic pictures
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