There is no magic or mystery about Pneumatic Tube equipment. It is just a matter of straight engineering skill and knowledge; engineering to design equipment that is efficient and troublefree; engineering to plan and lay out systems that best take care of requirements at a reasonable cost; engineering on the job to insure correct installation.
A 1947 Pneumatic Tube System brochure of the Grover company, 25527 W. Eight Mile Road, Detroit 19, Michigan.
Pneumatic Tube, Rohrpost, Buizenpost