DEFSTAN 68-75/1(1983) : 1983 AMD 1
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
BREATHING GAS PURITY FOR DIVING
23-04-1993
12-01-2013
Criteria including essential purity and dryness for oxygen, nitrogen, helium, air or gas mixtures supplied under pressure in cylinders for diving.
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