DEFSTAN 81-4/2(1977) : 1977
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
VALVES, CYLINDER, GAS
08-05-1992
12-01-2013
Lists various valves for gas transport cylinders and specifies requirements for materials of construction testing, quality control criteria and identification marking.
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