The National Grid Company PLC

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5604424 Electrical changeover switchingExpiredMay 04, 94Feb 18, 97[G05F]
5243848 Determining the volume of gases in transformer cooling oilExpiredApr 17, 92Sep 14, 93[G01N]

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