Antique Keuffel & Esser 10″ Polyphase Slide Rule Metal Glass Cursor Early Box
USD 77.38 USD
Specifications
| Original Box | Yes |
| Antique | Yes |
| Uses | Complex Slide Ruler |
| Patented Year | Patent Pending |
| Material | Brass & Wood |
| Time Period Manufactured | Pre-1930 |
| Country Of Origin | United States |
| Maker | Keuffel & Esser Co. |
| Industries Used In | Engineering & Science |
Keuffel & Esser Co. Appld For” – Original Box – Immaculate Early Variant Pre Model #. The rule’s construction and markings point strongly to an early 1900s production run (circa 1905–1915), making it one of the more desirable Polyphase examples on the market.
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