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Bs 556: Part 2, 1972, Concrete Cylindrical Pipes and Fittings
This is British Standard BS 556 Part 2, 1972, covering concrete cylindrical pipes and fittings.
Bs 5911: Parts 1 and 2, Precast Concrete Pipes and Fittings
This is British Standard BS 5911 Parts 1 and 2, covering precast concrete pipes and fittings.
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