ISO-4401 Complete Document History
Hydraulic fluid power - Four-port directional control valves - Mounting surfaces

Complete Current Edition:
   3RD EDITION - HYDRAULIC FLUID POWER - FOUR-PORT DIRECTIONAL CONTROL VALVES - July 15, 2005

Obsolete Revision Information:
   2ND EDITION - HYDRAULIC FLUID POWER - FOUR-P - Dec. 15, 1994
   1ST EDITION - HYDRAULIC FLUID POWER - FOUR-P - May 15, 1980