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USCGC Swivel ice-breaking at Bangor, Maine on the Penobscot River, in January 1991
USCGC Swivel (WYTL-65603) was one of fifteen 65-foot steel-hulled harbor tugs, that entered service with the United States Coast Guard in the 1960s. Each was built to replace the 64-foot wooden-hulled harbor tugs built during the 1940s.
^Colton, Tim (2012). "Gibbs Gas Engine". shipbuildinghistory.com. Retrieved 31 July 2012.
^"Swivel, 1961". U.S. Coast Guard Cutter History. 2012. Retrieved 31 July 2012.
USCGCSwivel (WYTL-65603) was one of fifteen 65-foot steel-hulled harbor tugs, that entered service with the United States Coast Guard in the 1960s. Each...
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However, Pen Duick IV featured another radical innovation in the form of swiveling masts, decades before the technology became mainstream. These masts did...
period, several significant alterations were made to the diving system. The swivel connecting the lift wire to the bell was replaced with a pair of shackles...
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