| Sub-Type | Ruler |
|---|---|
| Type | Engineering/ Surveying |
| Period | 1951 to Present |
| Material | Paper |
| Ruler included | No |
| Country of Origin | United Kingdom |
Check the listing for details. Instruction sheet for Helix Log Log International Slide Rule Vintage. Condition: Used, Made in United Kingdom. Listed at 4.30 USD. This advert is for the Helix Top Precision Slide Ruleinstructions sheet only. No rule included.
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