[78-L] Hello and a question

[Pablo Varela]

Hello all :)
I have a big doubt about history of recording of live events in 78's era.
For example, what kind of machine was used for recording Mahler's Ninth by Bruno Walter in Viena 1938. Common shellacs have 4 minutes playback by side. How was recording this performance without a break?
I hope I was clear because I usually speak in spanish.
Thank you in advance.
Pablo Varela.


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