BS

Thermally insulated underground pipelines
standard by BSI Group, 05/30/1986

Unplasticized PVC soil and ventilating pipes of 82.4 mm minimum mean outside diameter, and fittings and accessories of 82.4 mm and of other sizes. Specification
standard by BSI Group, 07/15/2001

Specification for dimensions of spur and helical geared motor units (metric series)
standard by BSI Group, 11/18/1969

Specification for railway turnouts for private users. Light grade turnouts over which British Railways locomotives do not operate, for axle loads not exceeding 10 tons, using flat bottom rails
standard by BSI Group, 04/30/1975