-----Original Message-----
From Robert Richard: 
" I'm unsure if any recordings studio or such existed in the city (small) where it was made. The above researchers surely had access to manufactured portable equipment..."

It was very common by 1941 to use telephone lines for remote recordings and broadcasts. That way there could be backup cutting systems and even a wax master for replication if the feed was to a record label studio as opposed to a nearby radio station.

Bob Olhsson Audio Mastery, Nashville TN
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