E51 may refer to: Nokia E51, a Symbian OS smartphone HMS E51, a British E class submarine European route E51, a road connecting Berlin and Nuremberg in Germany Nimzo-Indian Defence, Encyclopaedia of Chess Openings code Higashi-Kantō Expressway, route E51 in Japan Praga E-51, a Czechoslovak monoplane bomber prototype
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E51 may refer to: Nokia E51, a Symbian OS smartphone HMS E51, a British E class submarine European route E51, a road connecting Berlin and Nuremberg in Germany Nimzo-Indian Defence, Encyclopaedia of Chess Openings code Higashi-Kantō Expressway, route E51 in Japan Praga E-51, a Czechoslovak monoplane bomber prototype