1995GOST 30262-1995 Test procedures for determining physical properties of brush materials for electrical machines
1974GOST 9506.5-1974 Brushes for electrical machines. The method for determination of ash content
0000 GOST 9506-1965
GOST 9506.5-1974 Brushes for electrical machines. The method for determination of ash content was changed to GOST 30262-1995 Test procedures for determining physical properties of brush materials for electrical machines.