KEI Industries has extended its technical collaboration agreement with Brugg Kabel AG, Switzerland, for manufacture of extra high voltage (EHV) cables — above 220kV and up to 400kV. Earlier, it had signed a technical collaboration pact with Brugg Kabel for EHV cables of 66kV and up to 220kV in December 2009, which was later extended in November 2014 for another five years. The stock, which was ruling at around ₹6 in 2013, hit a peak of ₹139.5 this November.