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Hamamatsu Photonics K.K. began developing 20-inch diameter photomultiplier tubes at Toyooka Factory in 1979 for a 3000-ton-water Cherenkov particle detector, Kamiokande-II, upon a request by Professor Masatoshi Koshiba. 1071 PMTs mounted on it collected photons induced in the water by the particles falling on it. It detected a neutrino burst in the Supernova SN1987A to bring him a Nobel Prize in Physics in 2002.

I would like to propose the above sentence for a revised version of the Plaque Citation, in responce to the question/comment by Allisonmarsh.

Shizuo Mizushina02:21, 27 August 2013