Physical description
Folded thin transparent paper document with coloured graphics and text.
Inscriptions & markings
Kranz / Memoranda from the engineering department / page / 15 / Preheating of fresh air during / the drying process
Folded thin transparent paper document with coloured graphics and text.
Kranz / Memoranda from the engineering department / page / 15 / Preheating of fresh air during / the drying process