forkfork connectionfork oscillatorformform factorform wound coilformalformal conformant array parameterformal logicformal parameterformatformationformingformulaformulation languageforrite phase differntial circulatorfortranfortran formula translationforty five rpm recordforwardforward biasforward blockingforward conductingforward control channelforward converterforward couplerforward currentforward directionforward error correction mode bforward linkforward link access channelforward lossforward pathforward potentialforward recovery timeforward resistanceforward transfer admittanceforward voice channelforward voltageforward waveforward wave crossed field amplifiersfoucault currentfoundationfoundry servicefoundry wafer fabfourfour course radio rangefour horn feedfour layerfour layer device