This switch would command release of a particular launch pad umbilical away from the Apollo Saturn rocket when lift-off motion was detected. " /> Apollo Saturn Launch Umbilical Switch. <I>Approx. 11 in. long and 2 in. wide at the top. Label reads in part: "Switch, Sensor, Lift-off, Umbilical. Contract Number NAS8-5608 with several inspection stamps.</I> This switch would command release of a particular launch pad umbilical away from the Apollo Saturn rocket when lift-off motion was detected. | Christie's