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What do A1, A2, A3 and B stand for after an EP publication number in the “Also published as” list?

April 26, 2017A1 A2 A3 EP list publication stand

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What do A1, A2, A3 and B stand for after an EP publication number in the “Also published as” list?

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A1 stands for an application published with a search report, A2 stands for application published without a search report, A3 stands for the search report and B stands for patent specification .