BS 497:1967
Cast manhole covers, road gully gratings and frames for drainage purposes
https://doi.org/10.3403/30305670 (published 31/05/1967)
BS 497:1967 is maintained by . This standard is available from the following sources:
Other historical versions of this standard document also exist:
- BS 497:1952 [current until 31/05/1967]
- BS 497:1945 [current until 10/07/1952]
- BS 497:1933 [current until 17/12/1945]