The cable was manufactured by Japan Electricity Co. Ltd. (NEC) in 1936. This is a part of the joint equipment of non-loading cable carrier system provided for protecting the joint point of non-loading cable carrier system. Since the 1930s, this peculiar form of long-distance communication equipment had been used for a long time and can be said to have operated at the relaying position of the electric communication industry of our country and has the great technical and historical value.