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Includes preferred sizes, for circular and semi-circular protractors made from transparent plastics. Specifies qualities of suitable materials.
| Author | BSI |
|---|---|
| Editor | BSI |
| Document type | Standard |
| Format | File |
| Confirmation date | 2015-05-01 |
| EAN ISBN | 0 580 08089 7 |
| ICS | 01.100.40 : Drawing equipment |
| Number of pages | 8 |
| Replace | Replaces BS 2457:1954. |
| Year | 1970 |
| Country | United Kingdom |
| Keyword | BS 2457 ; BS2457 |