Courion has two styles of power operated Retiring Cams. The “Q” Series Retiring Cam begin shipping with Courion’s Power operated Freight Door Systems in 1999. The “P” Series Retiring Cam was shipped with Courion’s power operated Freight Door Systems prior to 1999. Courion also offers a Fixed or Stationary Cam for manually operated Freight Door Systems, as well as certain power operated Freight Door Systems.