Io mi astengo sempre dal dire balle se non sono sicuro. Comunque lo dimostro da un manuale americano:
EE-8 Military Field Telephone



The U.S. Army Field Telephones EE-8, EE-8A, and EE-8B is a portable field telephone desgned for use on either local or common battery telephone systems. The talking and signaling range varies with the type of wire used, the condition of the wire (dry, wet, frayed) and whether the wire is on the ground or in the air. As a local battery telephone, a talking range of 11 to 17 miles is typical, suitable for Corps area usage.
The phones are contained in a case approximately 9.5 x 7.75 x 3.5 inches weighing about 9.75 pounds including battery. The EE-8-A and -B are a little larger than the EE-8. The main difference between the EE-8 and the other models is that a section of the case lid has been cut out and replaced by flexible material to enable the handset to be hung on the case in a position to hold down the lever switch.

At the start of World War II, the EE-8 in a leather case wiih a leather strap was standard issue. However, experience in the Pacific showed right away that leather did not hold up and the EE-8 leather case was replaced by an olive drab canvas case with web strap. The EE-8 and EE-8A utilize an aluminum chassis while the EE-8B chassis is sheet steel.

PaoloM
PS: per la cronaca ho acquistato il mio telefono in Nuova Zelanda e li' i Marines lo avevano con la custodia di canapa.