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electro-contact
electro-contact adj. 
/iˌlɛktroʊˈkɑnˌtæk(t)/ now historical (attributive) designating a submarine mine that is detonated when contact closes an electric circuit; cf. observation mine n. at observation n. Compounds 2.
Brit. /ᵻˌlɛktrə(ʊ)ˈkɒntakt/
, /ᵻˌlɛktrə(ʊ)ˈkɒntakt/U.S. /əˌlɛktroʊˈkɑnˌtæk(t)/
, /əˌlɛktroʊˈkɑnˌtæk(t)//iˌlɛktroʊˈkɑnˌtæk(t)/ΚΠ
1880 C. Sleeman Torpedoes iv. 63 The inertia circuit closer is employed in connection with electro contact mines.
1903 Daily Chron. 25 June 4/3 The relative merits of electro-contact and observation mines.
2001 C. Jones in D. Stevens & J. Reeve Southern Trident xi. 163 [At the beginning of the twentieth cent.] there were two basic kinds of mine, electro-contact (EC) and electroobservation (EO) mines, the latter usually the larger.
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