Universal Constants as Manifestations of Relativity

We study the possible interpretation of "universal constants" by classification J.~M.~L\'evy-Leblond. $\hbar$ and $c$ are most common example constants this type. Using Fock's principle relativity w.r.t. observation means, we show that both can be viewed as manifestations certain relativity. also there is a possibility to interpret Boltzmann's constant in similar way, make some comments about relativistic spacetime curvature gravitational $G$.