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ItsACaragor t1_j73m2nb wrote

It’s explained in the short video.

They had three different written versions of the speech from three different sources but no actual recording to know which is the actual one.

They then found a guy who had access to Swiss military archives and apparently Switzerland kept extensive transcriptions of radio broadcasts in their archives and they had a very thorough transcription of the speech in swiss german. They translated it and compared it to the three other french versions they had to make what was most likely a very close transcription.

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