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Significats de ebonite ring en anglès

Encara no tenim significats per a "ebonite ring".
Ús de ebonite ring en anglès
1
B B B B are quartz pins, with heads inside the ebonite ring.
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2
A represents an ebonite ring into which the wire coil is cemented by means of paraffin.
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3
The ebonite ring A is bored with four radial holes, through which are slipped from the inside the fused quartz bolt-headed pins B.
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