Dittersdorf, string quartet no.4, Oertel

[coulonnus]

I have the parts of Dittersdorf's string quartet No.4 in C major, edited by Johannes Oertel, München. No plate number. Couldn't find this edition in Pazdirek's catalog.
Does anybody know the publication date?

Has this notice: Für ihre Concertvorträge bezeichnet von Gebrüder Müller.
I found this: http://de.wikipedia.org/wiki/Gebr%C3%BCder_M%C3%BCller

[Carolus]

Seems most likely to be public domain from your description.

[coulonnus]

Submitted!

[daphnis]

and approved. Nice scans as well. Please also try to include page numbers for each file submitted next time as this speeds up the approval process.