Telecommunications equipment / Automatic Telephone & Electric Co., Ltd.
Supplement to the compendium of the technical recommendations : issued by CCIF, CCIT, CCIR of the International Telecommunications Union / Automatic Telephone & Electric Co Ltd
Compendium of the technical recommendations : issued by CCIF, CCIT, CCIR of the International Telecommunications Union / Automatic Telephone & Electric Co Ltd
Mine signalling handbook / Automatic Telephone & Electric Co Ltd