A computer apparatus for receiving a removable communication card such as a radio card or a modem card. The compositions are particularly suitable for removing stains of vegetable origin, especially from textiles. The ball has advantages including moderate backspin upon driver shots, good travel distance performance, and durability against repetitive hits. It should also be possible, optionally, to load and unload a greater quantity of such transporting containers, wherein the exchange of transporting containers must be effected under favorable ergonomic conditions. A slot extends transversely into the plates from within a minor flow portion of the passage and connect into major flow outlet ports. The rotor has a metal exterior surface and one or more spiraling external lobes for cooperating with the stator to form progressing cavities between the stator and the rotor during rotation of the rotor.