These photo's were sent to me by the Dutch pneumatic tube supplier Ten Voorde. The photo's show a SEL installation in a Dutch hospital that was build in 1966. The photo's were probably taken before it was demolished and was replaced by a new system.
I don't have anything else to tell at the moment... Perhaps you recognize it and can give some more information? Please contact me and I will update this article!
Thanks to H. Ten Voorde Buispostsystemen for sending me these photo's.