Air Siam: Thailand’s first independent airline

What we know about Air Siam, Thailand's first independent airline: It was set up on September 15, 1965, suspended operations on January 11, 1972, and started again on March 7, 1972. It was closed for good on December 1, 1976. At the time Managing Director Vivat Vichitvadakarn cited heavy losses and the government's refusal to confirm if they would renew the airline's operating license. Any readers have more info on this company?