00671nam0 2200217 450 00001166220180618151947.020080522d1942----km-y0itay50------baengGBa-------001yyMagnetic crack-detectionnotes on working principles and use of apparatusby G. B. YoungLondonC. Griffin and company1942VIII, 60 p.ill.21 cm621.38119Young,G. B.631314ITUNIPARTHENOPE20080522RICAUNIMARC000011662621.381/1449452PISTMagnetic crack-detection1204287UNIPARTHENOPE