JT/T 251-2004
内河船舶上舵承
Upper rudder-bearer for inland waterway vessels
2004-06-03
JT/T 250-2004
内河船舶下舵承
Lower rudder-bearer for inland waterway vessels
2004-06-03
JT/T 284-1995
内河船舶舵系修理技术要求
Technical requirement on the steering repair of inland river ship
1996-04-19