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GB657127A
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Improvements in or relating to supersonic apparatus utilising a piezo-electric device
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GB619872A
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Supersonic apparatus utilising piezo-electric vibrators
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GB526641A
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Improvements in and relating to vibrators of the magneto-striction type
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GB416310A
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Improvements in and relating to acoustic sounding apparatus
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DE588257C
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Arrangement for generating oscillations of a piezoelectric capacitor circuit
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GB390332A
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Improvements in or relating to liquid tight closures for use in connection with sub-aqueous vibration transmitting or receiving apparatus
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GB389646A
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Improvements in and relating to echo-sounding apparatus for use on noisy aircraft
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GB358829A
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Improvements in or relating to recording apparatus more particularly applicable to oscillographs
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GB334778A
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Improvements in motion transforming mechanism
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GB292974A
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Improvements in method and apparatus for torpedo firing operations
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GB258235A
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Improvements in method and apparatus of the combined radio and ultra-audible type, for navigation purposes
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GB247930A
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Improvements in the method of and apparatus for the observation of the form of physical phenomena and for the measurement of their duration
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CA332944A
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Fluid tight closure
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