The telephone, a device for receiving and transmitting sounds remotely, connected to a connection (so-called telephone cable), was patented in 1876 by Alexander Graham Bell in the United States. Research and experiments on sound transmission had been conducted earlier in various countries, some of which were successful. However, it was Bell who first registered his invention and put it into use. In Poland, the first telephone trials took place as early as 1877. Soon, companies manufacturing telephone sets, telephone exchanges, and other necessary equipment were established in many countries. The Swedish company Ericsson was founded in 1876 and operates to this day. Its products appeared in Poland at the beginning of the 20th century, and in 1904, the company established the first telephone exchange in Warsaw. The presented telephone model was probably created at the turn of the 19th and 20th centuries. The quality of the company’s products is evidenced by the long use of the device, as evidenced by the secondary receiver, manufactured by the telephone factory in Radom, probably in the 1950s-1960s.
