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The 18"/48 caliber Mark 1 – United States Naval Gun was the initial name and design for a large caliber naval gun in the early 1920s. After the Washington Naval Treaty prohibited the development of guns larger than 16 in (406 mm), the gun was relined and finished as a high velocity 16"/56 Mark 4 gun.
The BL 18-inch Mk I naval gun was a breech-loading naval rifle used by the Royal Navy during World War I.It was the largest and heaviest gun ever used by the British. [1] Only the Second-World-War Japanese 46 cm/45 Type 94 had a larger calibre, 18.1 inches (46 cm), but it fired a lighter shell.
In March 2005, the United States Federal Communications Commission (FCC) made 8-1-1 the universal number for the 71 regional services that coordinate location services for underground public utilities in the U.S. [12] Before that time, each of these "call before you dig" services [13] had its own 800 number, and the FCC and others wanted to make it as easy as possible for everyone planning an ...