Ericsson LM private branch telephone exchange

Like the Siemens & Halske AG company in Germany, Lars Magnus Ericsson benefited significantly from the negligence of Alexander Graham Bell, the inventor of the telephone, regarding patents. As early as the 1870s, Ericsson established a company to produce and repair LM Ericsson telephone equipment. His factory supplied high quality telephone equipment to the Scandinavian markets at prices below those of the Bell Telephone Company. LM Ericsson six-number private branch exchange was used for handling an internal telephone network, for example at home, or in an office or small company. The exchange was not designed to work with the city network, although it operated in the central battery (CB) system, i.e., from an external power supply instead of its own inductor, as is typical for exchanges with a similar purpose. Manufacturer: Ericsson LM, ca. 1910 Inv. No.: MIM1097/VIII-36 Model prepared on the basis of photogrammetric measurements Licence: CC BY-NC-SA