Arnold Mononutu, Mohammad Hatta, and Hamengkubuwono IX observe a military parade in Yogyakarta on 20 February 1948
Hamengku Buwono IX, accompanied by about 20 other republican authorities, including the Deputy Prime Minister Sjafruddin Prawiranegara, the Minister of Information R. Samsudin, and the chairman of the working committee of the KNIP, Mr. Assaat inspecting some TNI posts on the Karo plateau, North Sumatra, September 1949.