Ericsson Phone 70's

The telephone (from the Greek: τῆλε, tēle, "far" and φωνή, phōnē, "voice"), colloquially referred to as a phone, is a telecommunications device that transmits and receives sounds, usually the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to each other. Developed in the mid-1870s by Alexander Graham Bell and others, the telephone has long been considered indispensable to businesses, households and governments, is now one of the most common appliances in the developed world. The word "telephone" has been adapted to many languages and is now recognized around the world.

All modern telephones have a microphone to speak into, an earphone (or 'speaker') which reproduces the voice of the other person, a ringer which makes a sound to alert the owner when a call is coming in, and a keypad (or on older phones a telephone dial) to enter the telephone number of the telephone to be called. The microphone and earphone are usually built into a handset which is held up to the face to talk. The keypad may be part of the handset or of a base unit to which the handset would be connected. A landline telephone is connected by a pair of wires to the telephone network, while a mobile phone (also called a cell phone) is portable and communicates with the telephone network by radio. A cordless telephone has a portable handset which communicates by radio with a base station connected by wire to the telephone network, and can only be used within a limited range of the base station.

The rotary dial is a device mounted on or in a telephone or switchboard that is designed to send electrical pulses, known as pulse dialing, corresponding to the number dialed. The early form of the rotary dial used lugs on a finger plate instead of holes. Almon Brown Strowger filed the first patent for a rotary dial, U.S. patent#486,909, on December 21, 1891 that was later issued to him on November 29, 1892.

The modern version of the rotary dial with holes was first introduced in 1904 but did not enter service in the Bell System until 1919.^{[citation needed]} The rotary dial was gradually supplanted by Dual-tone multi-frequency pushbutton dialing, introduced at the 1962 World's Fair, which uses a keypad instead of a dial. Some telephone systems in the US no longer recognize rotary dialing by default, but will only support push-button phones.^{[citation needed]}

Ericsson (Telefonaktiebolaget L. M. Ericsson) (OMX: ERIC B, NASDAQ: ERIC), one of Sweden's largest companies, is a provider of telecommunication and data communication systems, and related services, covering a range of technologies, including especially mobile networks. Ericsson is currently the world's largest mobile telecommunications equipment vendor with a market share of 35%.

Directly and through subsidiaries, Ericsson also has a major role in mobile devices and cable TV and IPTV systems. Ericsson was also the inventor of Bluetooth.

Founded in 1876 as a telegraph equipment repair shop by Lars Magnus Ericsson, it was incorporated on August 18, 1918. Headquartered in Kista, Stockholm Municipality, since 2003, Ericsson is considered part of the so-called "Wireless Valley". Since the mid-1990s, Ericsson's extensive presence in Stockholm has helped transform the city into one of Europe's hubs of information technology (IT) research. Ericsson has offices and operations in more than 180 countries, with more than 17,700 staff in Sweden, and also significant presences in, for example, Brazil, China, Finland, India, Ireland, Italy, Hungary, the UK and the US.

In the early 20th century, Ericsson dominated the world market for manual telephone exchanges but was late to introduce automatic equipment. The world's largest ever manual telephone exchange, serving 60,000 lines, was installed by Ericsson in Moscow in 1916. Throughout the 1990s, Ericsson held a 35–40% market share of installed cellular telephone systems. Like most of the telecommunications industry, Ericsson suffered heavy losses after the telecommunications crash in the early 2000s, and had to lay off tens of thousands of staff worldwide in an attempt to manage the financial situation, returning to profit by the mid-2000s.