The telefonic tripolar plug is the first type of telephone plug used in Italy. It has also been used in Finland, Norway and Turkey in older installations...

Telebrás plug, Brazil Tripolar plug, Italy BTicino 2021 (with or without line interruption), Italy (rare) This list covers only single-line telephone plugs commonly...

for telephone wiring. It is similar to the tripolar telephone plug of Italy and also the Swedish telephone plug. The plastic pin adds a presence function...

of speeds up to 90 miles per hour (145 km/h). A total of 24 six-volt “TriPolar” cobalt-lead storage batteries were mounted under the hood and under a...