Josef Hebel (DE)
Xaver Lutzenberger (DE)
Aertssen (BE)
Hentschke Bau (DE)
Verhoeven Bouw (NL)
Eng Lee (SG)
Haegens (NL)
Hwa Seng Builder (SG)
Methabau (CH)
Kibag (CH)
Peck Tiong Choon (SG)
Van Spijker (NL)