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US2438987A
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Radio navigational aid
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GB605048A
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Improvements in radio-navigational aids
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GB608220A
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Improvements in radio navigational aids
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GB576460A
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Improvements in and relating to high-frequency oscillators
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GB580985A
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Improvements in radio navigational aids
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GB567080A
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Improvements in and relating to continuously variable inductances and the like
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GB563420A
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Improvements in and relating to brazing and soldering
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GB574546A
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Improvements in and relating to electric filters
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IE16127L
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Constant gain thermionic amplifiers
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GB569303A
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Improvements in radio receivers for direction-finding
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GB536538A
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Improvements in thermionic amplifiers
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DE758211C
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Device for displaying the deviation of a vehicle from a course line
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