  In the present paper we discuss arguments, favouring the view that massive
fermions represent dislocations (i.e. topological solitons) in discrete
space-time with Burgers vectors, parallel to an axis of time. If to put
symmetrical parts of tensors of distortions (i.e. derivatives of atomic
displacements on coordinates) and mechanical stresses equal zero, the equations
of the field theory of dislocations get the form of the Maxwell equations. If
to consider these tensors as symmetrical, we shall receive the equations of the
theory of gravitation, and it turns out that the sum of tensor of distortions
and pseudo-Euclidean metrical tensor is the analogue of metrical tensor. It is
shown that we can also get Dirac equation with four-fermion interaction in the
framework of the field theory of dislocations. This model explains quantization
of electrical charge: it is proportional to the topological charge of
dislocation, and this charge accepts quantized values because of discrete
structure of the 4-dimensional lattice.
