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DE615819C
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Fluorescent screen, especially for Braun tubes
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DE615315C
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Fluorescent screen for discharge tubes, especially for Braun tubes
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DE729602C
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Gas-filled photocell for the purpose of optical sound reproduction
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DE685165C
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Gas-filled photocell with an external photoelectric effect
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DE685166C
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Gas-filled photocell with an external photoelectric effect
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DE615833C
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Alkali photocell
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DE624878C
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Process for the production of alkali photocells with an oxide-backed photoelectric layer arranged on a free-standing carrier plate inside the cell
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DE625823C
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Photocell in the form of a Dewar vessel
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