Antique Medical Device - Davis and Kidder's Patent Magneto Electric Machine $127.33 USD Sold on: 2015-Jun-09 Marketplace: eBay 2 Treasure 0 Trash 100% Detail: This early electro-therapeutic device produces alternating current electricity.The strength and frequency of the current is controlled by changingthe cranking speed. Electricity is generated by a pair... More Relevance Historical Items
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