| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Jul-2004 |
| Vintage Concise Circular Slide Rule Lot Rules | $73.01 | 18-Jul-2004 | 25 |
| CONCISE SCIENCE TABLES AND CIRCULAR SLIDE RULE | $33.50 | 25-Jul-2004 | 10 |
| Concise Circular Slide Rule & Case Very OLD!! | $21.51 | 04-Jul-2004 | 3 |
| Concise 28N Circular slide rule sliderule | $20.00 | 15-Jul-2004 | 1 |
| Vintage Concise Circular Slide Rule | $19.75 | 28-Jul-2004 | 7 |
| Unique Concise Circular Slide Rule CTCS-552 19 | $19.38 | 17-Jul-2004 | 6 |
| 3 Concise Circular Slide Rule Sliderule 28 28N | $19.00 | 25-Jul-2004 | 3 |
| 3 Concise Circular Slide Rule Sliderule 28 28N | $19.00 | 25-Jul-2004 | 3 |
| Key Line Concise Circular Slide Rule & Tiny He | $12.50 | 12-Jul-2004 | 2 |
| Concise 28 Circular Slide Rule and Case | $10.50 | 28-Jul-2004 | 2 |
| CONCISE CIRCULAR SLIDE RULE K-G LIKE NEW | $10.00 | 18-Jul-2004 | 3 |
| Circlular Slide Rule Concise #28 Pan Am | $8.00 | 14-Jul-2004 | 1 |
| Concise Circukar Slide Rule No 271 W/ Instruct | $7.50 | 15-Jul-2004 | 1 |
| Concise Circular Slide Rule No. 28 Marked FORE | $4.24 | 18-Jul-2004 | 2 |