Nowadays, many companies attach more and more importance to after-sales service, especially in mining machinery industry, the brand can be easily be ruined y am imperfect service system. However, there indeed some companies ignore to set up a sound service system but reap immediate interests, which is a insurmountable barrier for long-term development. We always hear that Company A, even deliveries goods which are defective once they received payment from customer, and be indifferent to customers queries afterwards, and drawings of company B were found unreasonable design until customer received equipments, which delayed the project thus resulting in great losses to customer, however company B turned a blind eyes...