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BS 109:1922

Air-break knife switches and air-break isolating switches for voltages not exceeding 660 volts excluding totally-enclosed and flame proof types
standard by BSI Group, 01/30/1933

BS 2094-1:1954

Glossary of terms relating to iron and steel-General metallurgical, heat treatment and testing terms
standard by BSI Group, 03/04/1963

BS 2000-143:1985

Methods of test for petroleum and its products-Asphaltenes in petroleum products (precipitation with normal heptane)
standard by BSI Group, 02/28/1985