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DE741609C
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Reflector for elongated discharge tubes, which unites the radiation on the moving surface of the material to be traced in light tracing machines
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DE719538C
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Electric high pressure discharge lamp, in particular high pressure mercury lamp, with glow electrodes, a noble gas base filling and a glow lamp base
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DE735802C
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Device for changing the transmission ratio by means of a control gear for blueprint devices
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DE754219C
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High-pressure metal vapor lamp, in particular high-pressure mercury lamp, with fixed, non-activated heating electrodes
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DE692450C
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Device for making blueprints
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DE714288C
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Device for making blueprints
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DE725980C
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Power supply for electrical discharge vessels, especially made of quartz, and process for their production
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DE660955C
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Device for uniform irradiation of surfaces moving relative to the light source for purposes of reproduction, blueprint or display technology
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DE697179C
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Device for uniform irradiation of flat objects moving relative to the light source
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DE470488C
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Device for concentrating the light from rectilinear light sources, in particular quartz burners
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