1927
    		• No. 2 Automatic Desktop Telephone Set Introduced
    		• Tokyo Metropolitan Public Telephone Booths Change from Hexagonal Red Design to Light-Gray Square Style
    		• The No. 3 Large-Scale Common-Battery Intercity Exchange
    1928
    		• Japan's First Long-Distance Charged Cable Service Begins (between Tokyo and Kobe)
    1930
    		• Photo-telegraph service introduced (NE-type)
    1931
    		• Placing of advertisements in the telephone directory starts
    1933
    		• No. 3 Desktop Telephone Set Completed
    1934
    		• New Year's Telegram Service Begins
    1936
    		• Condolence Telegram Service Begins
    1943
    		• First telephone collection
    1945
    		• Single number service formally introduced
    museum@mod.hqs.ntt.jp