| http://www.w3.org/ns/prov#value | - To permit quick and accurate setting of the proper material condition of closure, fittings are classified and marked X, Y, Z and W. This system of classification is fully described in Chapters 7 and 8 of FTP-170B and includes designations for doors, hatches, valves, and other fittings and systems whose proper operation is important in obtaining the designated material condition of closure.
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