The history of Zhengzhou Polytechnic Black Lion Amusement Machinery Co., Ltd In August 1989, company's father led his five family members to make a first trampoline in a small workshop, and managing the ride himself In 1990, company father employed 10 workers to produce and sell trampoline In 1992, company enlarged to hire 30 workers, and renting workshop and setting up processing department. Mainly producing trampolines, bumper cars and other small amusement rides In 1995, company ...