| Material | Plastics |
|---|---|
| Period | 1901 to 1950 |
| Type | Please see descriptions |
Check the listing for details. 4 specialist vintage analog calculators Map Cement Unit conversion Roller ruler. Condition: Used. Listed at 16.84 USD. Ruler from ARC Premix. Rolling ruler with inset protractor. The roller gives formulae for circles, triangles. BSI conversion slide. How we used to do our sums before the digital computer. to and from BSI and imperial units.
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