Keywords: USS N-4 (SS-56).jpg en wikipedia 2012 July 15 N-4 SS-56 United States Navy submarine http //www navsource org/archives/08/08056 htm 1918 1922 U S Navy photograph PD-USGov-Military-Navy Original upload log en wikipedia USS+N-4+ 28SS-56 29 jpg 2009-12-01 03 12 Mdnavman 1399×970× 95180 bytes <nowiki> United States Navy submarine N-4 SS-56 http //www navsource org/archives/08/08056 htm Sometime between 1918 and 1922 U S Navy photograph Permissio</nowiki> __NOTOC__ Ships built in 1917 Ships built in Connecticut Naval ships of the United States World War I submarines of the United States |