Kelvin and Hughes Mk 5 miniature "Supersonic" ultrasonic flaw detector serial No. KH3/242. Kelvin and Hughes Mk 5 miniature "Supersonic" Ultrasonic Flaw Detector
Ultrasonic Flaw detector by Kelvin and Hughes Ltd, 1959-1960 Ultrasonic flaw detector, 1956-1960. 1959-1960
