Question:
Where was Joichi Suetsuna educated in Apr, 1930?

Context:
 Joichi Suetsuna attended University of Göttingen from Jan, 1927 to Jan, 1929. 
 Joichi Suetsuna attended University of Tokyo from Jan, 1919 to Jan, 1922. 
 Joichi Suetsuna attended University of Hamburg from Jan, 1929 to Jan, 1931.

Answer:
University of Hamburg