Current is transmitted through ball bearings in a now swivel joint for telephone and e.lertric light wires, designed ki prevent them from twisting.
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https://paperspast.natlib.govt.nz/newspapers/TS19170719.2.29.2
Bibliographic details
Star (Christchurch), Issue 12063, 19 July 1917, Page 4
Word Count
23Page 4 Advertisements Column 2 Star (Christchurch), Issue 12063, 19 July 1917, Page 4
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