A multi-channel pipetter has a U-shaped housing with horizontal upper and lower arms and an interconnecting hand grip portion. A plurality of nozzles that serve to support replaceable tips are mounted on the lower arm in a vertical orientation and are connected by a flexible tubing that extends upwardly...http://www.google.de/patents/US4824642?utm_source=gb-gplus-sharePatent US4824642 - Multi-channel pipetter
