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Rubber dam - Patent 0928847
Rubber dam
This Day in Patent History - The iconic "Imbertson inflatable gate" was patented on March 16, 1965 - Patent Yogi LLC
Dyrhoff Ltd on Twitter: "On 17th August, we completed installation of the second rubber dam at the @GreenMtnPower Essex 19 hydro station in Vermont, USA. The original Bridgestone rubber dam was installed
Palmer Falls Installation Completed - Dyrhoff UK Ltd : Inflatable Rubber Dams and Spillway Gates
Dyrhoff Ltd on Twitter: "On 17th August, we completed installation of the second rubber dam at the @GreenMtnPower Essex 19 hydro station in Vermont, USA. The original Bridgestone rubber dam was installed