3 ms·
First ask yourself why the old tubes built in the 1800s were abandoned. http://en.wikipedia.org/wiki/Pneumatic_tube http://en.wikipedia.org/wiki/Pneumatic_tube
by johngalt 16y ago
First ask yourself why the old tubes built in the 1800s were abandoned. http://en.wikipedia.org/wiki/Pneumatic_tube http://en.wikipedia.org/wiki/Pneumatic_tube