Question:
Who was the head of Lannemezan in Sep, 1983?

Context:
 Pierre Bleuler is the head of the government of Lannemezan from Mar, 1977 to Mar, 2001. 
 Bernard Plano is the head of the government of Lannemezan from Mar, 2001 to Dec, 2022. 
 Paul Baratgin is the head of the government of Lannemezan from Jan, 1929 to Dec, 1966.

Answer:
Pierre Bleuler