The conglomerate is set to make a 12x profit on its $6.4m investment, made in 2006.
The educational services provider will partner with Touchdown Ventures, a venture capital firm co-founded by two ex-employees of Comcast Ventures.
NTT Docomo was joined by Konica Minolta and Flextronics in the round, which will fund commercialisation of Knightscope's robotic crime prevention system.
Legend-backed online property listings company Uoko has secured $22m in a series B round that also featured SIG China and Matrix Partners.
Human resources software company 1-Page has acquired the assets of Norwest-backed networking service BranchOut, which had raised $49m, for only $5.4m.
The media company took a 25% stake in online property listings site PropTiger, leading a $37m series B round that took its funding to $42m.
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