A plastic container with a bottom and, connecting continuously onto the edge thereof a standing wall of random shape defining an upper circular edge portion on which can be placed a cover provided with a peripheral groove for receiving the edge portion, the cover and the edge portion being provided with...http://www.google.sh/patents/US5143389?utm_source=gb-gplus-sharePatent US5143389 - Wheeled support frame for a removable plastic container having closure and actuating device
