Uploader acknowledged on his talk page that he is not the actual copyright holder of this image. If it was published in 1930, it will be out of copyright in the US in 2026. Whether it is out of copyright in Germany depends on the actual provenance and authorship.
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{{Information |Description={{en|1=Andrussow pilot plant in Herne, Germany for testing HCN-production, 250 kg/d}} |Source=Own work by uploader |Author=Hermann Luyken |Date=1930 |Permission= |other_versions= }} <!--{{ImageUpload|ful