WorkVenture gives you an inside look at what it's like to work at T.u.m. Power Supply Co., Ltd., office & team photos, reviews and more. This is the T.u.m. Power Supply Co., Ltd. Company Page. All content is posted anonymously by employees currently or previously working at T.u.m. Power Supply Co., Ltd..Apply to Thai OpticalApply to DaishoApply to GoWabiApply to WorkVenture Technologies