JIS B 8652:1989 Test methods for electro-hydraulic proportional pressure reducing valves and electro-hydraulic proportional pressure reducing and relieving valves
2002JIS B 8652:2002 Test methods for electro-hydraulic proportional pressure relief valves and electro-hydraulic proportional pressure reducing and relieving valves
1989JIS B 8652:1989 Test methods for electro-hydraulic proportional pressure reducing valves and electro-hydraulic proportional pressure reducing and relieving valves