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Piezoelectric device
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Improvements in or relating to method of cementing ceramic transducers
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Device for controlling light intensity
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Electro-acoustic device
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Capacitive measuring head
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Method of polarizing ceramic transducers
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GB679086A
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Magnetic recording and reproducing apparatus
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GB679085A
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Erasure means for magnetic recording devices
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Magnetic reproducing device with means to prevent accidental erase of record medium
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GB691276A
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Method of changing the concentration of solid particles in paper mill waste liquid
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GB681463A
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Concentrating solid particles in a gas
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Electroacoustic device
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GB676847A
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Improvements in or relating to piezoelectric device
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GB676848A
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Improvements in or relating to piezoelectric device
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Moistureproof piezoelectric crystal element
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Automatic erase for magnetic recorders
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GB668709A
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Stopping device for magnetic recorder
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Process for making transducer devices having bonded elements
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GB673729A
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Polarization of ceramic transducer material
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GB671269A
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Improvements in or relating to multi-layer magnetic record members
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