In A the motifs in the R.H. in the 2nd halves of bars 51-53 and 60-63 are provided with 
hairpins of varied range. According to us, it should be related to the clearly less diligent notation of this page in A (cf., e.g., the remark on accidentals). In similar situations in the first section of the Etude (bars 10-13 and 20-23) the hairpins always (eight times) embrace entire motifs. This is how the marks were generally reproduced in the editions, except for bar 52 (the mark starts later, in accordance with A) and separately discussed bars 53 (reversed mark) and 62 (omission). In the main text we suggest a unified version of the hairpins, compatible with the natural, and in this case rather obvious, musical sense.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: Inaccuracies in FE, Scope of dynamic hairpins
notation: Articulation, Accents, Hairpins