GOST 10493-1981 Rigin and compensating lens-shaped seals for pn20-100 mpa (200-1000 kgf/cm2). Technical specifications
GOST 1050-1988 Carbon structural quality steel gauged bars with special surface finish. General specifications*, 1988-12-22 Update
GOST 22790-1989 Assembly units and pipeline parts for Pnom 9,81-98,1 MPa (100-1000 kgf/sm sq). General specifications*, 1989-12-22 Update
GOST 22791-1983 history
1983GOST 22791-1983 Assembly units and pipeline parts. Dead lenses with indicator for Pnom 9,81-98,1 MPa (100-1000 kgf/sm sq). Construction and dimensions