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GB892972A
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Improvements in or relating to surface testing apparatus
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GB892529A
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Improvements in or relating to surface testing apparatus
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GB742062A
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Improvements in or relating to optical measuring or testing apparatus
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GB737794A
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Improvements in or relating to the measuring or testing of the accuracy of section profiles
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GB722135A
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Improvements in or relating to spindle mountings
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GB727899A
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Improvements in or relating to optical projection systems
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GB728588A
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Improvements in or relating to optical measuring or testing apparatus
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GB716719A
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Improvements in or relating to spindle mountings
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GB694423A
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Improvements in or relating to pivotal joints
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GB675488A
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Improvements in or relating to apparatus for measuring or indicating the roughness or undulations of a surface
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GB665748A
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Improvements in or relating to recording apparatus
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GB632353A
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Improvements in or relating to electrical measuring apparatus
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GB613102A
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Improvements in or relating to recording apparatus
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GB486851A
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Improvements in or relating to sighting telescopes
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GB485863A
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Improvements in short-base rangefinders
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GB482202A
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Improvements in optical scale-reading apparatus
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GB474096A
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Improvements in sight testing instruments
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GB449830A
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Improvements in sight testing apparatus
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GB441302A
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Improvements in coincidence rangefinders
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GB445339A
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Improvements in photographic roll film spools and film therefor
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