Sae electrohydraulic flow-control servovalves, standard

What is for sale: Sae electrohydraulic flow-control servovalves, standard

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Here we have SAE Aerospace Standard ARP 490D Electrohydraulic Flow-Control Servovalves, 1978, 64 pages.
Purpose. Scope. Abbreviations. Terminology. Procurement specifications. Recommended test methods. Quality assurance and reliability considerations.
Previously a library copy(ies).
Lightly read, minimal page creasing, no inner page rips or tears found. Jacket/covers have light edge, surface, and corner wear.
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