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The article was printed in the June 1947 issue of the USA professional military reference magazine ‘Military Review’.
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I've seen varying dimension figures for them.
The swept path was too narrow to be useful for mine clearance (60 yards wide in 6 fathoms; 20 yards in 11 fathoms, which was difficult to mark accurately) but they were used to prove shipping lanes were clear of pressure mines. They were not very successful (only 1 mine seems to have been able to be attributed to them). EC7 was wrecked in a gale in 1945. They were exceptionally unwieldy vessels to tow.
7 were sent to Japan in late 1945 but were no more successful there.
There was also a project in Britain to construct concrete barges for the same purpose but they proved no more successful.
The most interesting attempt to sweep pressure mines were the 2 Cybele class minesweepers which were built in 1943/44 before the Germans had even laid their first pressure mine of Normandy for the Allies to encounter. Referred to a Stirling Craft, they were again craft requiring towed. Used in trials only, during which they were damaged.
See Peter Elliot's "Allied Minesweeping in World War 2" published 1979.