Question:
Who was the chair of Industrial Union of Metal in Jan, 1953?

Context:
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990.

Answer:
Question:
Who was the chair of Industrial Union of Metal in Jan, 1953?

Context:
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990.

Answer:
user
Artur Baumann
assistant
Question:
Who was the chair of Industrial Union of Metal in Jan, 1953?

Context:
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990.

Answer:
user
Reinhard Sommer
Herbert Dönitz
Gerhard Nennstiel
Hartwig Bugiel
assistant
Question:
Who was the chair of Industrial Union of Metal in Jan, 1953?

Context:
 Herbert Dönitz is the chair of Industrial Union of Metal from Jan, 1957 to Jan, 1960. 
 Artur Baumann is the chair of Industrial Union of Metal from Jan, 1953 to Jan, 1953. 
 Gerhard Nennstiel is the chair of Industrial Union of Metal from Jan, 1988 to Jan, 1989. 
 Reinhard Sommer is the chair of Industrial Union of Metal from Jan, 1961 to Jan, 1988. 
 Hartwig Bugiel is the chair of Industrial Union of Metal from Jan, 1989 to Jan, 1990.

Answer:
user
Artur Baumann
assistant