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$780
白色合板面台 尺寸：150×220×10mm 裝有交流電鈴一個、開關一個，接線端子2個，附有導線及插頭1條。
Used to demonstrate the construction of the electric bell. Consists of a 110V AC bell and a switch mounted on a 150mm× 220mm base with four rubber stand.
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