The history of the Pneumatic Tube System, a theoretical explanation of the air proportions on Pneumatic Tube Systems and descriptions of several system components.
Author: DeTeWe (Deutsche Telephon Werke und Kabelindustrie A.G. Berlin) Language: German First Edition: 1929 ISBN: -
Die entwicklung und der heutige stand der Stadtrohrposttechnik
Pneumatic Tube, Rohrpost, Buizenpost