  Based on the principle of relativity with two universal constants (c, l) and
in the inertial motion group IM(1,3)\sim PGL(5,R), with Lorentz isotropy, in
addition to Poincar\'e group of Einstein's SR the dual Poincar\'e group
preserves the origin lightcone and its space/time-like region R_\pm appeared at
common origin of intersected Minkowski/dS/AdS space. The dual Poincare
kinematics is on a pair of degenerate Einstein manifolds with
\Lambda_\pm=\pm3l^{-2} for R_\pm, respectively. Thus, there is a Poincar\'e
double and the dS double for dS/AdS SR. Further, with other four doubles they
form a relativistic quadruple for three kinds of SR on M/D_\pm, respectively.
The dS SR with the dS-dual Poincare double provides new kinematics for cosmic
scale physics.
