Well ... ΝΝ-25 C 20:1
Well ... ΝΝ-4 771, 772 C 20:1
Well ... ΝΝ-25 4801 C 20:1 ... 26 May 1947
Well ... ΝΝ-20 3941, 3942 C 20:1 ... 3 April 1947