German submarine U-4: Revision history


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23 September 2021

21 September 2015

13 December 2013

12 December 2013

7 September 2010

16 April 2010

11 October 2009

1 March 2009

27 January 2009

20 October 2008

15 October 2008

10 October 2008

16 December 2007

18 February 2007