W David Stern
In the early 1920's my mother worked as a secretary in Germany. She
knew of at least two German shorthand systems. The one she used was Stolze-Schrey (spelling?). If the document in question here is indeed
from Germany, then you might want to pursue this.
Googling "german shorthand systems" brings up several other systems, including Gabelsberger, which is the other system that my mother would mention.
-=David Stern=- in California