As a result of the English expression Original Equipment/Entrusted Manufacture (translated into the original equipment manufacturer OEM or origin)
It is therefore referred to as OEM. Basic meanings of the brand producers do not produce products.
But to use their own hands the critical core technologies to design and develop new products and control of sales channels, specific processing tasks through contract order entrusted with similar products of other factories. After the product price bought, and a direct bearing on their own brand.
Its products are known as OEM products. It is evident that fixed production of processing trade.