The pair of 
signs, present only in FC, was certainly added by Chopin. The hairpins were repeated in GE and later also in EE3, yet the range of signs in these editions is closer to these written in bars 39-40.
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category imprint: Differences between sources
issues: EE revisions, Inaccuracies in GE, Scope of dynamic hairpins, Authentic corrections of FC
notation: Articulation, Accents, Hairpins