Mr. David in US owns a doors&windows company, he hires workers to do installation work, each worker at least $500 each day, and he needs at least 6 workers each day. He came to us so we suggested him our glass vacuum lifter robots, he came to China to check our machine and very happy with it, he ordered a vacuum lifter robot for indoor use, a spider crane for outdoor also some small vacuum lifter, we are very glad we can help clients like David, please feel free to contact with us if you need any help.