73836118
Nov 6, 1989
Oct 15, 1991
INDUSTRIAL TESTING APPARATUS; NAMELY, TEST COUPON HOLDERS AND RETRIEVERS RELATING TO THE INSERTION AND RETRIEVAL OF COUPON SAMPLES FROM PIPELINES TO PERIODICALLY CHECK FOR CORROSION AND WEAR OF THE PIPELINE DUE TO FLOW OF THE MEDIUM SUCH AS CORROSIVE FLUIDS OR SUSPENSIONS THROUGH THE PIPELINE
Electrical and Scientific Apparatus