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Title (en)
Double siren after Helmholtz
Title (de)
Doppelsirene nach Helmholtz
Language
Not applicable
Description (en)
Inventory number V/41.
Description (de)
Inventar-Nummer V/41.
Photographer
Franz Sachslehner
Manufacturer
Sauerwald, Berlin
Licence Selected
CC BY 4.0 International
Details about the source
Time Coverage (de)
vor 1900