B-class submarine

There have been Four B classes of submarine:

• The British B class of eleven submarines launched in 1904–1906
• The Norwegian B class of six submarines built from 1922 to 1929
• The Spanish B class of six submarines launched in 1922-1925
• The United States B class of three submarines launched in 1907
• The Japanese Type B submarine, three classes submarines
  • I-15-class submarine (Type B1 submarine)
  • I-40-class submarine (Type B2 submarine)
  • I-54-class submarine (Type B3 submarine)