H and H & H Specialties manufactures a complete line of machines for motorizing stage and acoustic curtains. Draw machines for operating curtain tracks are available with grooved winding drums, traction drives, or sprocket drives. Lift Machines for masking and lift curtains are available with grooved winding drums or sprocket drives. All machines are equipped with magnetic reversing starters and limit switches for fully automatic operation between preset curtain positions. An unlimited number of remote control stations can be utilized, in addition to the local controls included on each machine. Each single phase motor is instantly reversing, eliminating the need for safety time-delay relays. All curtain machines are equipped with low voltage control circuits.