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BS 2457:1975 – Specification for protractors for drawing office use

Available as PDF document for immediate download, or as printed publication – yes

Number of pages – 8 pages, A4

Manufacturer – BSI

Price – GBP 30

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Keywords – Protractors, Drawing office equipment, Office equipment, Plastics, Instrument scales, Graduations, Marking, Flatness (surface), Size, Preferred sizes, Dimensions, Diameter, Thickness, Semi-circular shape, Circular shape