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Unmarked set in unusual case, includes a roller marked 'Pat'd '99,' plus electrode pen. Connecting posts and rheostat to top. In long black wooden case with leatherette covering, double latches to front. Measures 9.5 x 19 x 4 inches.
Shows wear and age to roller and pen, case shows some exterior wear.
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| Estimate | $20 - $2,000 |
| Starting Bid | $10 |
