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The 310 uses printed-circuit boards but the 310A | The 310 uses printed-circuit boards but the 310A | ||
returned to ceramic strip construction. | returned to ceramic strip construction. | ||
P2 phosphor was standard. | P2 [[phosphor]] was standard. | ||
P1, P7 and P11 were also available. | P1, P7 and P11 were also available. | ||