Mord per Rohrpost
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A murder mystery book written in German by Günter Rudorf.
The title of the book is in German "Mord per Rohrpost", translated into English it will be "Murder per pneumatic tube system".
Pneumatic Tube, Rohrpost, Buizenpost
Pneumatic Tube Calendar
5 September 1898 (125 years ago)
Commissioning Pneumatic Tube Mail Amsterdam in the Netherlands