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US2338463A
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Process of making filaments consisting of pure silicic acid
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GB504883A
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Method of making filaments of pure silica, particularly quartz
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GB512700A
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Process and apparatus for the continuous spinning of filaments and ribbons from quartz and other refractory oxides
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GB508013A
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Articles of vitreous quartz and process for producing and working them
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GB510081A
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A process for the manufacture of products of vitreous sintered quartz
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US2270718A
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Article of vitreous quartz and process for producing and working it
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GB479617A
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Improved apparatus for increasing the size and/or brightness of pictures produced by picture projection apparatus for television and other purposes
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US1987220A
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Method and apparatus for operating incandescent bodies
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GB373817A
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Electric discharge lighting tubes with rare gas filling, in particular for illuminated advertising purposes
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US1923891A
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Apparatus for refracting light rays
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GB336359A
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Apparatus for singling out light rays of a certain spectral range
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GB316094A
|
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Improvements in or relating to lamps
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US1792046A
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Arrangement for singling out parallel monochromatic light rays from a cone of light
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GB194754A
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Improvements in and connected with electric incandescent lamps
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GB172615A
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Improvements in and connected with electric incandescent lamps
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