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Old 23rd March 2019
  #218
Lives for gear
 
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PLease excuse the spam...

Emil Berliner Studios probably holds the answer? This site mentions Neuman and 2 addresses - it makes sense that the Neumann Factory was set up in tandem or next to Emil Berliner Studios and Deutsche Grammophon - Stralauer Allee 1, 10245 Berlin.

Deutsche Grammophon, founded by Emil Berliner in 1898, opened its Berlin headquarters (Markgrafenstra├če 76) in 1900. It was primarily a recording studio with three recording rooms.

Emile Berliner - Wikipedia

Deutsche Grammophon - Wikipedia

Emil Berliner Studios - Wikipedia