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Ultrasonic transducer unit to locate cracks in rail base
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Siren detector
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Transducer arrangement for ultrasonic rail tester coupling carriages
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Transducer arrangement for ultrasonic rail tester coupling carriages
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Photoelectric print reading circuit
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Wide range monostable multivibrator
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Pattern control superheterodyne motor control system
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Coupling liquid apparatus for ultrasonic testing
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Electrical generator regulating systems
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Ultrasonic inspection system
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Coupling method and apparatus for ultrasonic testing of solid bodies
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Diode gating circuit
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Means for ultrasonic inspection of rail
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Method and means for transmitting elastic waves
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Apparatus for ultrasonic materials testing
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Vibration testing device
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