BS 679:1989
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for filters, cover lenses and backing lenses for use during welding and similar operations
Hardcopy , PDF
15-09-1996
English
30-06-1989
Requirements for transmittance, optical quality, refractive properties, permanence and robustness. Gives guidance on selection and use.
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