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GB276680A
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Improvements in acoustic sounding apparatus
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GB256584A
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Indicating apparatus applicable to use in depth-sounding by the acoustic method and other purposes
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GB234994A
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Improvements in acoustic installations for measuring depths and distances and for like purposes
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GB236023A
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Improvements in acoustic depth-sounding and measuring installations for ships and air-craft
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GB238639A
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Improvements in devices for measuring brief intervals of time
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GB181389A
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Improvements in the method of ascertaining the altitude of aircraft
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US1630689A
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Method for ascertaining the flying height of flying machines
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US1494986A
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Device for measuring very short time intervals
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US1649378A
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Means for sounding or measuring distance in water
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GB164011A
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Improvements in or relating to a device for measuring very short time intervals
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GB182873A
|
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Improvements in means for sounding or measuring distances in water
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GB147420A
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Improvements in or relating to submarine sound receivers
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