June 6, 1977
Japan’s Fast Breeder Reactor “Joyo”
A commemorative postage stamp on the Attainment of Criticality of the ‘Joyo‘ (nuclear reactor), Oarai, Ibaraki prefecture, Honshu island, Japan : Issued by Japan Issued on Jun 6, 1977 Issued for : A postage stamp was brought out to commemorate the attainment of criticality of the first Japanese experimental fast
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