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GB653809A
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Improvements in or relating to display apparatus
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GB657491A
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Apparatus for the illumination of objects and optical projection and viewing thereof
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GB603201A
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Improvements in equipment for optical projection
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GB612919A
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Apparatus for the illumination and display of objects
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GB616294A
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Apparatus for optical projection and demonstration in daylight
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GB608734A
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Apparatus for visual display and demonstration
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GB608628A
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Equipment for demonstration and display
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GB585669A
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Improvements in apparatus for demonstration and display
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GB541226A
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Apparatus to intensify hearing
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GB531455A
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Improvements in and relating to apparatus for demonstrating electrical experiments
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GB522022A
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Apparatus for the assembly, display and optical projection of objects and apparatus
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GB512146A
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Units for the construction of apparatus for experimental work in mechanics
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GB431726A
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Improvements in and relating to the construction of objectives for optical instruments
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GB345013A
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Improvements in and relating to the construction and adjustment of optical apparatus
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GB305780A
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Improvements in and relating to the construction and adjustment of optical and otherapparatus and appliances
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GB289574A
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Improvements in and relating to the construction and adjustment of optical and other apparatus and appliances
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GB262913A
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Improvements in and relating to recording apparatus for investigating the motion of moving bodies
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