Antique Electromagnetic Knife Switch Assembly c. 1890–1910
Updated August 6, 2026
| Lot number | 0306 |
| Estimate | $10 - $400 |
| Opening bid | $10 |
| Category | Sporting Goods & Outdoors |
| Auction | Kevin Shail Antique Collection 4 electric fan |
| Date | August 23, 2026 at 6:00 AM EDT |
| Auction house | Sphere Auctions LLC |
| Location | Sun Prarie, Wisconsin |
Antique electromagnetic knife switch or relay assembly featuring four original copper-wound coils, laminated iron cores, and heavy brass terminals mounted on a cast iron base. Used in early
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