An item reported that experiments were executed consisting of various sweeps and detecting devices against magnetic mines. At least nine different devices were tested and of which several seemed to be able to let mines exploded.
Source
The National Archives, Kew Gardens, England CAB-66-4-1 Weekly Résumé (No. 14) of the naval, military and air situation from 12 noon 30 November to 12 noon 7 December 1939.
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