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US2473835A
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Means for the interchange of electrical and acoustical energy
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US2473354A
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Device for transmitting and receiving compressional waves
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US2458415A
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Apparatus for echo distance measurement
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US2469594A
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Hoist-lower control
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GB627900A
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Improvements in or relating to bathythermographs
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GB633077A
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Improvements in or relating to means for producing mechanical vibrations
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US2473453A
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Method of extracting oils from fish material
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GB626323A
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Improvements in or relating to high frequency spark transmitting systems
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US2470244A
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Electrical reproducing stylus
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GB632162A
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Improvements in or relating to wideband amplifiers
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GB618884A
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Improvements in or relating to magnetostriction oscillators
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GB617918A
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Improvements in or relating to automatic control circuits
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GB627250A
|
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Improvements in devices for testing and measuring the hardness of the beds of oceans
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GB620490A
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Improvements in or relating to electrical mounting stacks
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GB645686A
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Improvements in or relating to apparatus (or devices) for producing compressional waves of high frequency, particularly for sub-aqueous signalling
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GB619511A
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Improvements in or relating to sound transmitter and receiver
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GB619679A
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Improvements in or relating to piezoelectric vibrator
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GB621045A
|
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Improvements in or relating to spark gaps
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GB619958A
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Improvements in or relating to radio transmitters
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GB622211A
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Improvements in or relating to pick-up loops for ultra-high radio frequencies
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