Keuffel & Esser 4286 Planimeter
Updated August 28, 2026
| Lot number | 1073 |
| Estimate | $400 - $10,000 |
| Opening bid | $200 |
| Auction | Inventions and Technology Auction |
| Date | September 26, 2026 at 9:00 AM CDT |
| Auction house | Donley Auctions |
| Location | Union, Illinois |
An exceptional find for the precision instrument collector, this early 20th-century rolling sphere planimeter was ...
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