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PDF Standards BS 3939-11:1985

Graphical symbols for electrical power, telecommunications and electronics diagrams-Architectural and topographical installation plans and diagrams
standard by BSI Group, 06/28/1985

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PDF Standards BS 2547-1:1976

Specification for basic dimensions of cones and tubes for winding textile yarns-Cones for yarn winding (cross wound). Half angle of the cone 3°30'
standard by BSI Group, 10/29/1976

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