BS 639:1969
Specification. Covered electrodes for the manual metal-arc welding of mild steel and medium tensile steel. Metric units
https://doi.org/10.3403/30305912 (published 29/09/1969)
BS 639:1969 is maintained by . This standard is available from the following sources:
Other historical versions of this standard document also exist:
- BS 639:1986 [current until 15/03/1995]
- BS 639:1976 [current until 31/10/1986]
- BS 639:1964 [current until 29/09/1969]
- BS 639:1952 [current until 01/07/1964]