A suction device includes a suction cell formed to include a cup having an open end and a stem extending from a side of the cup opposite from the open end. A control system is connected to the stem and arranged to form a partial vacuum in the cup such that the cup is attached to the substrate. The control...http://www.google.com/patents/US6854412?utm_source=gb-gplus-sharePatent US6854412 - Underwater vacuum attachment device
