POST OFFICE BOX, PLUG TYPE |
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Fitted in elegantly polished wooden case Plug type, with three pairs of ratio coils of 10,100 and 1000
ohms and 16 series coils from 1 to 5000 ohms, total 11,110 ohms, giving a range from 0.01 ohm to
1,111,000 ohms. Two tapping keys are provided for battery and galvanometer. |
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