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US2549834A
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Control circuit for multiple sound reproducers
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GB649587A
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Passive impedance matching network
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US2539454A
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Picture signal mixer circuit
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GB643210A
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Light modulating system
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GB619880A
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Push-pull amplifier tube
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GB614691A
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Signal level control circuit using thermionic valves
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GB615585A
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Distribution system for high frequency electrical energy
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GB617925A
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Antenna for radiating circularly polarized waves
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GB614680A
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Frequency divider circuit
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GB617915A
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Improvements in or relating to the recording and reproduction of sound on film
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GB610661A
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Saw-tooth wave generator
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GB612435A
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Television synchronising signal separator
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GB618775A
|
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Improvements relating to radio communication and signalling systems
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US2429772A
|
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Phototube multiplier
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US2426697A
|
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Electrode assembling in television projection tubes
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GB619957A
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Rectifier circuit frequency multiplier
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GB636107A
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Electron discharge tube for differentiating an input signal
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GB611523A
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High vacuum electron discharge device
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GB609827A
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Velocity modulated electron discharge device
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GB603126A
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Concentric optical system
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