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span-wire
span-wire n.
Brit. 
/ˈspanwʌɪə/
, /ˈspanwʌɪə/U.S. /ˈspænˌwaɪ(ə)r/
/ˈspænˌwaɪ(ə)r/ΚΠ
1897 Pall Mall Gaz. 30 Oct. 6/2 The current..passes out to the main conductor, or overhead wire, which is supported over the centre of the track by insulators attached to span wires extending from uprights placed on either side of the roadway.
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