The company has produced more D6S because companies want to produce more goods D6S SR due to the profit from the sale D6S better than SR , so it must buy equipment that is more complex and more specific.
The company has production D6S more because companies want to produce more goods D6S SR เนื่องจากผลกำไร from sales D6S is better. SR therefore need to buy machinery, sophisticated and elaborate more .