Question:
Which employer did Aarne Üksküla work for in Mar, 1963?

Context:
 Aarne Üksküla works for Estonian Drama Theatre from Jan, 1993 to Jan, 2002. 
 Aarne Üksküla works for Vanalinnastuudio from Jan, 1988 to Jan, 1993. 
 Aarne Üksküla works for Rakvere Theatre from Jan, 1961 to Jan, 1968. 
 Aarne Üksküla works for Endla Theatre from Jan, 1968 to Jan, 1978.

Answer:
Rakvere Theatre