| Concise |
| Description | Price | Date | Bids |
Prices of slide rules sold on ebay (the internet auction) in Aug-2004 |
| Alvin Elite Slide Rule& Concise Circular Slide | $40.00 | 18-Aug-2004 | 1 |
| "Concise Circular Slide Rule and Tables, Case | $26.00 | 26-Aug-2004 | 3 |
| Concise 28 Circular Slide Rule with Case | $26.00 | 16-Aug-2004 | 8 |
| Takeda Concise circular slide rule w? conversi | $23.50 | 26-Aug-2004 | 5 |
| "CONCISE CIRCULAR SLIDE RULE & CASE, VINTAGE" | $20.50 | 16-Aug-2004 | 6 |
| CONCISE CIRCULAR SLIDE RULE AND CONVERSION TAB | $20.45 | 02-Aug-2004 | 9 |
| 1969 CONCISE SCIENCE TABLES & CIRCULAR SLIDE R | $20.00 | 08-Aug-2004 | 3 |
| Sama & Etani Concise Circular Slide Rule - RAR | $18.50 | 20-Aug-2004 | 5 |
| "Concise Circular Slide Rule Conversion Tables | $12.50 | 09-Aug-2004 | 3 |
| Concise Circular Slide Rule Holiday Inn | $10.56 | 22-Aug-2004 | 5 |
| CONCISE ROUND SLIDE RULE...NEVER USED | $10.51 | 13-Aug-2004 | 6 |
| Concise Circular Slide Rule-Case/Manual | $10.03 | 12-Aug-2004 | 6 |
| Concise Slide Rule Round No. 28 in Case w/inst | $9.95 | 26-Aug-2004 | 1 |
| Reddy Kilowatt Concise Circular Slide Rule Rul | $9.50 | 17-Aug-2004 | 3 |
| CONCISE ROUND SLIDE RULE...NEVER USED | $8.07 | 04-Aug-2004 | 5 |
| Concise Circular Slide Rule and Case | $5.75 | 04-Aug-2004 | 8 |
| KEY LINES CONCISE CIRCULAR SLIDE RULE NO 28N | $2.99 | 17-Aug-2004 | 1 |
| Concise No. 28 Circular Slide Rule Made in Jap | $25.00 | 02-Aug-2004 | 0 |
| "CONCISE CIRCULAR SLIDE RULE & CASE, VINTAGE" | $9.99 | 09-Aug-2004 | 0 |