DEFENCE supplier Ultra Electronics, which has operations in Birmingham and Rugeley, has expanded with the £8m acquisition of a US power business.The company, which also supplies the energy and transport sectors, has agreed to acquire the power conversion business operated by RFI Corporation, a wholly-owned subsidiary of DGT Holdings Corp, in a cash deal worth $12.5m.Ultra said RFI is an established manufacturer of proprietary, high-voltage, power conversion subsystems including electronic filters, high voltage capacitors, pul......for the full story register now for free or login below...