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GB1115275A
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Ophthalmological apparatus
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GB1073845A
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Method and apparatus for copying planar originals
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GB1098409A
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Refractionometer
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GB1080204A
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Means for flattening the image field of electron image tubes
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GB1092357A
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Sight testing apparatus
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GB1067652A
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Ophthalmometer
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GB1012838A
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Illuminating device for opthalmoscope
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GB995529A
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An improved ophthalmoscope
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GB1055647A
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Sight testing apparatus
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GB1042954A
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Apparatus for measuring the power of spectacle lenses
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GB1029406A
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Lens system for electron image tubes
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GB1012524A
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Photographic objective
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GB1006576A
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Improvements relating to photographic enlarging objectives
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GB974380A
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Spectacle frames
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GB1011753A
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Optical system with variable focal length
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GB1008788A
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Adjustable support for instruments
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