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Значения термина ebonite ring на английском

Значения для термина "ebonite ring" отсутствуют.
Использование термина ebonite ring на английском
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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