The Talking Machine Forum — For All Antique Phonographs & Recordings

Its like in New York - the fashion industry clusters around a specific area. Ritterstr seems to have been populst for the phono/ gramo trade: a small example
Ritterstr. 70 - Berliner Electr Mech Phonog. Werkstatt
Ritterstr. 75 – A. Nathan / Flurstedt (Cylinder Manufacture)
Ritterstr. 75 - Polyphonograph-Gesellschaft Cohn & Co.,
Ritterstr. 75 - Verband der Deutschen Phonographen-Industrie.
Ritterstr. 63 – Zonophone GmbH
Ritterstr. 71 – International Zono Co
Ritterstr. 77D – August & Co
Ritterstr. 44- Czempin & Krug
Ritterstr. 17 – Symphonion Automaten
Ritterstr. 74 - Brauer & Rehwinkel (horn Manufacturers)
Ritterstr. 74 & 36 – Deutsche Grammophon

Wow. That's quite a list...

I think the list is much longer - when I have more time I continue

this is a Berlin logo (I'll make a better photo)