| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Sep-2004 |
| VINTAGE 60's PAN AM CONCISE CIRCULAR SLIDE RUL | $28.00 | 25-Sep-2004 | 14 |
| Vintage CONCISE CIRCULAR SLIDE RULE MIP DOW CH | $26.01 | 19-Sep-2004 | 7 |
| Vintage CONCISE CIRCULAR SLIDE RULE (Mint In P | $17.50 | 02-Sep-2004 | 5 |
| "Circular Slide Rule (Concise brand, MINT)" | $15.50 | 22-Sep-2004 | 4 |
| CONCISE CONVERSION TABLES & CIRCULAR SLIDE RUL | $10.50 | 08-Sep-2004 | 6 |
| CONCISE CIRCULAR SLIDE RULE w/conversion table | $7.60 | 25-Sep-2004 | 7 |
| Concise Takeda Circular Slide Rule | $6.05 | 16-Sep-2004 | 3 |
| Unusual Circular Slide Rule Concise Chiyoda Ja | $5.74 | 10-Sep-2004 | 3 |
| vintage SLIDE RULE - round CONCISE No. 28 with | $4.99 | 05-Sep-2004 | 1 |
| Concise brand circular slide rule | $3.50 | 01-Sep-2004 | 1 |
| "Circular Slide Rule (Concise brand, MINT)" | $7.50 | 12-Sep-2004 | 0 |