sentences:  PBX, shared service, incoming calls barred (ICB), temporary out of service (TOS) etc.This was a capacitor store, and it held information on a thin plastic strip, into which could be inserted up to 10 little copper squares which had a capacitance of 10 pF.The thin plastic strips were then inserted into the Data Store rack, one at the position representing the directory number and another at the position representing the equipment number.