  We consider the quantum mechanical problem of the motion of a spinless
charged relativistic particle with mass$M$, described by the Klein-Fock-Gordon
equation with equal scalar $S(\vec{r})$ and vector $V(\vec{r})$ Coulomb plus
ring-shaped potentials. It is shown that the system under consideration has
both a discrete at $\left|E\right|<Mc^{2} $ and a continuous at
$\left|E\right|>Mc^{2} $ energy spectra. We find the analytical expressions for
the corresponding complete wave functions. A dynamical symmetry group $SU(1,1)$
for the radial wave equation of motion is constructed. The algebra of
generators of this group makes it possible to find energy spectra in a purely
algebraic way. It is also shown that relativistic expressions for wave
functions, energy spectra and group generators in the limit $c\to \infty $ go
over into the corresponding expressions for the nonrelativistic problem.
