Figure 4a TALKING DOLL: A NEG'ATOR constant-torque motor provides the drive to the voice box mechanism in this popular talking doll.

Figure 4b COMPUTER WINDOW: NEG'ATOR constant-torque motors smoothly and automatically return the window of this computer tape deck to its closed position.

Figure 4c AIRCRAFT DOOR: Compact NEG'ATOR constant-torque motors provide counterbalancing energy to this aircraft door.

Figure 4d X-RAY MACHINE: Eight NEG'ATOR constant-force springs drive four output drums to counterbalance this heavy but delicate X-ray machine head.