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Directory Results for Welded steel cylinders made of definitely prescribed steels - specification DOT-4BA (HSE). Welded steel cylinders made of definitely prescribed steels - specification DOT-4BA (HSE) - hse gov to Welded steel cylinders made of definitely prescribed steels with electric-arc welded longitudinal seam - Specification DOT-4BW HSE Welded steel cylinders made of definitely prescribed steels with electric-arc welded longitudinal seam - - -