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| Thornton | |||
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Mar-2008 | |||
| Thornton No P221 Slide Rule | $15.50 | 20-Mar-2008 | 9 |
| Slide Rule British Thornton #P221 Engineering | $0.99 | 16-Mar-2008 | 1 |
| VINTAGE ENGLISH SLIDE RULE PIC No 111 THORNTON | $14.99 | 09-Mar-2008 | 0 |
| VINTAGE ENGLISH SLIDE RULE PIC No 111 THORNTON | $14.99 | 02-Mar-2008 | 0 |