The first telephones in the 1870s were rented in pairs which could only talk to each other, but the example of a central exchange was soon found to be even more advantageous than in telegraphy.
The use of a central exchange was soon found to be even more advantageous than in telegraphy. The first telephones in the 1870s were rented in pairs which were limited to conversation between those two instruments.
The first telephones in the 1870s were rented in pairs which were limited to conversation between those two instruments. The use of a central exchange was soon found to be even more advantageous than in telegraphy.
The first telephones in the 1870s were rented in pairs which were limited to conversation between those two instruments. The use of a central exchange was soon found to be even more advantageous than in telegraphy.