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Radio treated porcelains, clockwise starting from the far left OB 74, sort of an olive-brown RT SOBT 81 (ST = silent type), rose coloured RT NGK Japan 90, a dark burgundy RT NGK Japan 85, a dark burgundy RT (Triangle ) Japan (small brown) PLH ANSI 55-2 Columbia 1997 249 Lorenzetti 1992 Brazil W (in a circle) OB CP 84 ( in the centre of the group) |