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Automatic dialing device for dial telephones
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Method and apparatus for recording and reproducing television pictures
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Electronic light amplifier
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Frequency modulating device
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Color television system
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Cathode beam tube
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Method of and apparatus for bunching electrons
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High-voltage generator
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Method of and apparatus for determining the ground speed and/or course of aircraft
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Means and method for altitude determination
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Sound reproducing device
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Sound-reproducing device
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Light-controlling means
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Sound-controlled means for producing light variations
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Endless sound record and mechanism therefor
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Radio receiving system
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Telephone device
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Endless-film arrangement
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US1446246A
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Means for recording and reproducing sound
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US1561596A
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Indicating device for fluid tanks
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