A business created to service the needs of the foundry industry's green sand controls systems. A leading supplier for aftermarket parts and service for equipment originally produced by Hartley Controls Corporation. We are a leading supplier of process control equipment for the production and quality of green sand used in the metalcasting industry. GSC sells and services compactibility controls sys...A business created to service the needs of the foundry industry's green sand controls systems. A leading supplier for aftermarket parts and service for equipment originally produced by Hartley Controls Corporation. We are a leading supplier of process control equipment for the production and quality of green sand used in the metalcasting industry. GSC sells and services compactibility controls systems and foundry automation systems.