The B712 wing was the DC/MD design that served for 50 years - outsourced to a Korean factory (Halla) by Boeing for that particular version.
Perhaps being a bit anal here, but Boeing had nothing to do with outsourcing the wing to Korea - that decision was made by MacDac years before the MD/Boeing merger.
Unfortunately it was that same outsourcing mentality that the former MacDac execs brought to Boeing after the merger that crippled the 787 development...