| Country of Origin | United States |
|---|---|
| Material | Vinyl Plastic |
| Era | 1950s |
| Function | Drafting |
| Shapes Included | Polygons, Triangles |
Check the listing for details. Speed-Up Geometry Ruler Baltimore Drafting Tool 1950s Protractor Stencil. Condition: Used, Made in United States. Listed at 27.99 USD. The device combines the functions of a ruler, protractor, and stencil set into a single unit constructed of flexible vinyl plastic. The booklet exhibits age-related discoloration. This item represents an example of drafting technology and mathematical instruction from the mid-20th century.
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