TY - SOUND ED - British Broadcasting Corporation. TI - Communications T2 - BBC sound f.x.c.d PY - 1987/// CY - London PB - BBC Enterprises N1 - B.T. domestic telephones - B.T. payphones - B.T. lines and tones - B.T. equipment and exchanges - Computers, telex and typewriters - Printing machinery and copiers - Automatic letter sorter - Time signals ER -