WorkVenture gives you an inside look at what it's like to work at O.A.ADVERTISING CO., LTD., office & team photos, reviews and more. This is the O.A.ADVERTISING CO., LTD. Company Page. All content is posted anonymously by employees currently or previously working at O.A.ADVERTISING CO., LTD..Apply to HarnApply to Whats on your mindApply to Dream ExpressApply to WIKA Instrumentation