YANKEY ENGINEERING CO LTD revenue for the last year amounted to 15.15 B TWD, the most of which — 15.19 B TWD — came from its highest performing source at the moment, Plumbing, Heating and Air-conditioning Services, the year earlier bringing 15.51 B TWD. The greatest contribution to the revenue figure was made by Taiwan — last year it brought YANKEY ENGINEERING CO LTD 11.38 B TWD, and the year before that — 13.44 B TWD.