2007GOST R 52715-2007 Vacuum equipment. Pipeline fittings. Mounting dimensions
2007GOST R 52715-2006 Vacuum equipment. Pipeline fittings . Mounting dimensions
GOST R 52715-2007 Vacuum equipment. Pipeline fittings. Mounting dimensions was changed to GOST R ISO 9803-1-2013 Vacuum technology. Mounting dimensions of pipeline fittings. Part 1. Non knife-edge flange type.