Type U 31 attack submarines

u 31  This mid-sized gas insert provides ample radiant and convective heat for most mid-sized living spaces The U31 gas insert includes a variable speed blower  German submarine U-31 was a Type VIIA U-boat of Nazi Germany's Kriegsmarine during World War II She was laid down on 1 March 1936 as yard number 912,

U-31 is a Type 212A submarine of the German Navy, and the lead ship of her class U-31 was built by TKMS, with construction taking place at the U-31 was the first U-boat to be sunk by an aircraft in WWII She was on sea trials in the Heligoland Bight following a refit when Squadron Leader Miles Delap

About: German submarine U-31 U-31 is a Type 212A submarine of the German Navy, and the lead ship of her class U-31 was built by TKMS, with Java™ SE Development Kit 8, Update 31 The full version string for this update release is 0_31-b13 The version