After the contract is signed, the seller provides the buyer with the construction drawings of the plant and other engineering buildings in accordance with the contract. On January 30, 1985, the buyer opened the letter of credit No. 85 / 455129 with the amount of 216 million yen in favor of the seller through Zhuhai branch of Bank of China, and requisitioned 6590 square meters of land for the preparation of the factory building, leveled the land and built the factory building according to the req