Trans - Sumatra Highway
Section III of Sawatambang-Muarabungo-Lubuklinggau Highway Project with the total length of 73 km, running through the thickest jungle area of Sumatra, Indonesia. Construction period was from December 1973 to March 1978. Stage I was completed in 1975, far ahead of the schedule with much prsise for is unparalleled effciency and quality of work. Samwhan started Section IV & V of Sawatambang-Muarabungo-Lubuklinggau Highway Project in April 1982 and completed in March 1983. Section IV : 74 km-long highway with 2 lanes. Section  V : 77 km-long highway with 2 lanes.
Union Oil Attaka Onshore Facilities
Plant construction work consisted of oil storage tanks, tank loading pumps, generators, booster pumps, crude heaters, etc. The plant is located in Santan, Kalimantan, Indonesia and was completed in 1973.
Balikpapan Area Housing Complex
Construction work of a huge housing complex on a vast sandy hill of Balikpapan, East Kalimantan, Indonesia was completed of 25 housing complex, 3 apartment buildings, clinic, recreation center, commissary and office buildings. The project was completed in 1974.