Guler, Erhan2015-04-062015-04-062008Journal of Science and Technology 2 (1), 2008, 86-981307-3818In this work, it is given that a timelike generalized helicoid of (null axis, null profile curve) type is isometric to a timelike rotation surface of same type by Bour's theorem in Minkowski 3-space. In addition, it is obtained that these surfaces are not minimal and have not got the same Gauss map. Moreover, some relations between the mean, Gauss, the second Gaussian and the second mean curvature of the helicoidal surfaces of (L,L)-type are investigated in Minkowski 3-space.enTimelike helicoidal surfacesGauss mapsecond mean curvaturesecond Gaussian curvatureArticle