| 摘要 |
The apparatus is composed of (A) two sets of zinc alloy core (4)(6)/ silver-coated copper coils (3)(5) arranged in iron case (2) contg. drain valve (2'), which run through a iron perforated pipe (1), (B) copper coil wire (9) arranged in contact with the inside wall of iron case (2), and an extended-wire from one end of (9) holds (4)(6) by coil around, and (C) screwed cap (7)(8) capping both ends of iron case (2).
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