
Beyond those glass doors lies the electronic instrument room in the Deutsches Museum. Peter Forrest, author of the excellent A-Z Books, posted a question on the AH list asking if anyone heard of the "Siemens modular synth from around 1970, with a very large number of oscillators, a pin matrix, and an interesting triangular design?

flickr by jacktastic. full size
"Siemens electronic music lab circa 1960ish. The highlight of any trip to Munich and star of the Deutches museum."

Synthesizer. flickr by thefoggiest. full size
I also found the following:

hofner guitar with Oberheim DX, Casio VLTone and? flickr by thefoggiest. full size
click here for the Musical Instruments page on the official Deutsches Museum website. BTW, if anyone has more info on the Siemens please comment. If you have more images send them my way. My contact info is at the bottom right of the site.
Update: also see this link (in Googlish here).
Update via swissdoc in the comments:
"Whenever you are in the Museum, make sure to visit the HighVoltage Show and the "Bergwerk".
The Siemens Studio is featured on 6 pages in issue 03/07 of the "Synthesizer-Magazin". You can still get a copy here (in German only).
What looks like a modular synth is indeed "just" a bank of oscillators built 1956. It features 1 Tieftongenerator (Dual) which is a Dual-LFO, 19 oscillators (sinus or sinus to square variable, AR Env) and a Noise Generator (takes static noise from an FM receiver). There is a patchpanel to interconnect the oscillators.
There is a CD available with music recorded in that studio:
link
link
There is a small booklet available "Siemens-Studio für Elektronische Musik / [Hrsg.: Siemens-Kulturprogramm]" which can be found in German libraries with a little luck.
Some further links on the topic:
link
link
Georg."
Link to the Synthesizer Magazin issues in Googlish