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Classic tests of CPT symmetry have been done in the neutral-meson system.These have been continued with new results in the framework of theStandard-Model Extension, where the coefficient for CPT violation is both boostand direction dependent. Recent contributions and new phenomenologicalimprovements are discussed with possible new contributions for $b$ and $d$specific correlated decays at the Belle II asymmetric energy collider.

New Searches for CPT Violation in Neutral-Meson Oscillations