C. August Schmidt Söhne is a factory and installation company for technical equipment from Hamburg, Germany and was founded at 18 April 1841. Since 1866 they also built all over the world pneumatic tube systems.
"Kupferschmiede, Apparatetechnik & Wärmetauscher - Förderbänder & Rohrpostanlagen" [E] "Coppersmiths, apparatus technology & heat exchangers - Conveyor belts & pneumatic tube systems"
From 1950 the company was called CASS.
In 1963 CASS has been taken over by the Serck company.
Advertisement 1940 - Bauwelt-Katalog Berlin - 9 Jahrgang
Sources and more information
100 Jahre CASS - C. Aug. Schmidt Söhne, Hamburg
1841 - 1941
First Edition: 1941 ISBN: not available
The book was published in 1941, since this is more than 70 years ago the text and photo's from the book are believed to be in the Public Domain.