Here is what I have learned from other sites and help from other people:
The patent it lists the inventors names as:
Edward Alfred Graham and Leslie Harold Paddle
(Graham) Amplion is the inventor's last name; he's from London, England. Patented in 1927 in the USA. More info at Google-Patents. I also see "Alfred Graham" as the inventor
Amplion Company who deal with radio and telecommunication devices in the 1920's are in London and also in Toronto, Canada, USA
The Inter Phones Box states an address of the Chrysler Building, NYC, New York, so perhaps the Amplion company made it there as well.
Box Bottom weak especially the bottom.
Box Bottom one side of box missing (see pictures.)
Box Top Complete although split (all there no pieces missing.)
Litho on box overall good condition, a tad dirty (see photos.)
Damage to one ear/speaking piece (flatten a bit.) (must have been a robo call)
Overall good condition
8 �" X 3�"
Each device is approx 3 5/8"
the patent number is US1711410
Contact me with any comments/Questions.. I am fast to respond.