GOST 31440.3-2011 Reciprocating internal combustion engines. Safety requirements for design and construction of engines for use in potentially explosive atmospheres. Part 3. Group III engines for use in flammable dust atmospheres
2011GOST 31440.3-2011 Reciprocating internal combustion engines. Safety requirements for design and construction of engines for use in potentially explosive atmospheres. Part 3. Group III engines for use in flammable dust atmospheres