Abstract: An object sensor (18) detects an object such as a hand (20) and operates a valve (52) that permits liquid soap (86) to flow from a disposable soap container (12). The liquid soap is typically quite viscous but tends to be expelled because of pressure applied from a carbon-dioxide cartridge (32). A pressure-regulator assembly (40) permits gas from the carbon dioxide cartridge (32) to enter the soap container (28) only so long as the soap container's internal pressure is less than a predetermined maximum.

Abstract: A display system for the interchangeable presentation of art prints or other substantially flat display objects, and for the storage of a number of such prints not being displayed. Magnets are disposed within recesses in a background member or plaque and these magnets engage metallic plates or foil elements permanently affixed to the back of a picture to be displayed for secure mounting thereof to the plaque in a predetermined orientation. A mat may be provided surrounding the displayed picture and it may also be maintained in position by magnetic means.