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The S.56B seems also to have been known as the S.31. (cf https://archive.org/details/aerodigest1819unse/page/n569/mode/1up) But why?
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The S.56B seems also to have been known as the S.31. (cf https://archive.org/details/aerodigest1819unse/page/n569/mode/1up) But why?