Electrical apparatus and instruments, particularly telecommunication machines, apparatus and instruments, including transceivers and other radio-telephone equipment, car radios, car cassette tape players, v.h.f. marine radios, u.h.f. marine radios, commercial and land mobile transeivers, cordless telephones, corded telephone, citizen band radios, and other radio recievers, tape and cartridge palyers and tape recorders and parts and accessories therefor.