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日本ＮＴＴ与其东京支社通信业务状况（１９９３年３月用户数）（规划院）日本NTT与其东京支社通信业务状况（1993年3月用户数）...
The Status of Communications Business between Japan NTT and Tokyo Branch (Number of Users in March 1993) (Planning Institute) State of Communication between Japan NTT and Tokyo Branch (Number of Users in March 1993) ...