Thanks to Wu Juan, Vincent Eltschinger and Birgit Kellner for their immediate responses.
Wu Juan has put his scan on archive.org: <https://archive.org/details/PaulMus1939LaLumiereSurLesSixVoies>.
archive.org
Paul Mus 1939 La lumière sur les six voies
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Dear colleagues,
Alas I did not meet with any success concerning Benveniste & Renou 1934.
Here's another item I am looking for: