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They study range-finding; erection, operation, and maintenance of telegraph and telephone lines; planting of land and submarine mines; handling of torpedoes; erection and demolition of bridges; building of roads; knotting and splicing of ropes; handling of heavy weights; fitting of gun-gear and the various methods of slinging and transporting ordnance, and the mounting in suitable shore positions of guns of 3, 5, and 6 inch caliber.
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