Abstract: A movable fastener that permits, among other things, the interlocking of 3.5 inch flexible disk cartridges or "floppy disks." The fastener can project from the flexible disk cartridge when desired to fasten to another flexible disk cartridge. The fastener can be placed anywhere within the flexible disk cartridge where it will not interfere with the magnetic media, the shutter, the write protect hole and tab, the disk size indicator, or any other feature integral to the proper functioning of the flexible disk cartridge. Mortise and tenon, interference, and friction fit type fastener configurations are disclosed.

Abstract: Liquids are segregated into separate chambers within a common container. The chambers are formed by fabricating the container in an hourglass design thus dividing it into upper and lower segments. The chambers are serviced by separate pumps which draw the constituent liquids independently and deliver them through a common outlet. The chambers are isolated from one another by inserting the pump servicing the lower chamber through the upper chamber and fitting it snugly into the waist of the hourglass. The pumps servicing the upper and lower chambers move in tandem and are fixed together by a common pump head. The pump head also serves as the outlet through which the constituent liquids are delivered. Liquid is delivered in fixed quantities from the lower chamber via an elongated pump mechanism. Liquid is delivered in adjustable quantities from the upper chamber via a modified pump design.