Aubrey E Corbett, Siu L Ho, Ronald J Clark: Inflatable supports. Glynwed Group Services, Larson Taylor and Hinds, October 7, 1980: US04225989 (162 worldwide citation)

A ripple bed has an upper and a lower inflatable layer. The upper layer has separate air passages which are independently inflatable and deflatable to provide the rippling effect. The lower layer is separately inflatable to provide support over any area of the upper layer which is deflated.

Norman Gordon, Robert V Elliott, Charles W Donkin, Aubrey E Corbett: Tape drive having a selectively retractable drive hub. M4 Data, Fay Sharpe Beall Fagan Minnich & McKee, July 13, 1993: US05227935 (3 worldwide citation)

In order to enable a tape drive machine to be constructed in a housing (30) with low height, a hub (36) which in operation projects from a drive motor (34) into a tape cartridge (10) is retractable into the motor (34) to permit the cartridge (10) to be slid out from the machine in the edgewise direc ...