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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

Seems most likely to be public domain from your description.

Submitted!

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.