Question:
Which employer did John Crank work for in Mar, 1946?

Context:
 John Crank works for Brunel University from Jan, 1957 to Jan, 1981. 
 John Crank works for University of Cambridge from Jan, 1939 to Jan, 1945. 
 John Crank works for Courtaulds from Jan, 1945 to Jan, 1957.

Answer:
Courtaulds