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Apparatus for generating frequency modulated signals
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Improvements in or relating to method and apparatus for measuring wave propagation time
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Improved apparatus for maintaining a predetermined spatial relationship between two objects
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Improvements in or relating to method and apparatus for measuring wave propagation time
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Improvements in or relating to ultrasonic coupling apparatus
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Ultrasonic measurement apparatus
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Methods and apparatus for measuring wave propagation time
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Apparatus for coupling ultrasonic waves
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Automatic positioning device
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