1990GOST 18720-1990 Television camera tubes. Methods of measuring for parameters
1976GOST 18720.11-1976 Television camera tubes. Methods of measurement for signal-tu-noise ratio
GOST 18720.11-1976 Television camera tubes. Methods of measurement for signal-tu-noise ratio was changed to GOST 18720-1990 Television camera tubes. Methods of measuring for parameters.