BS 4558:1970
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for positive pressure, powered dust respirators
Hardcopy , PDF
09-15-1994
English
03-17-1970
Specifies requirements for respirators comprising a mask supplied with filtered air from a power pack, to provide protection whilst reducing the respiratory load.
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