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The head mount freed the switchboard operator's hands, so that they could easily connect the wires of the telephone callers and receivers. [10] The head-mounted telephone receiver in the singular form was called a headphone. [11] [12] These head-mounted phone receivers, unlike modern headphones, only had one earpiece. [13] By the 1890s a ...
A handset is a component of a telephone that a user holds to the ear and mouth to receive audio through the receiver and speak to the remote party using the built-in transmitter. In earlier telephones, the transmitter was mounted directly on the telephone itself, which was attached to a wall at a convenient height or placed on a desk or table.
Harman Kardon designed and produced some of the first high fidelity audio products in the 1950s. The company's first product was an FM tuner.. Early integrated receivers (with a tuner, preamplifier and power amplifier) were an attempt to create, improve and produce high fidelity performance in a single unit.
A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations. A modern communications receiver, used in two-way radio communication stations to talk with remote locations by shortwave radio. Girl listening to vacuum tube console radio in the 1940s.
Alexander Graham Bell was awarded the first U.S. patent for the invention of the telephone in 1876. Elisha Gray, 1876, designed a telephone using a water microphone in Highland Park, Illinois. Tivadar Puskás proposed the telephone switchboard exchange in 1876. Thomas Edison invented the carbon microphone which produced a strong telephone ...
Early foreign made Trimline, December 1986. 90s Trimline phone made by Lucent/Philips and branded AT&T. The Trimline telephone is a series of telephones that was produced by Western Electric, the manufacturing unit of the Bell System. These telephones were first introduced in 1965 and are formally referred to as the No. 220 Hand Telephone Sets.
AN/VRC-12. The AN/VRC-12 is the lowest-numbered element of a family of vehicular VHF - FM synthesized vehicular radio communications systems developed by Avco Corporation [ 1] and introduced around 1963 and used extensively by the U.S. military during the Vietnam War and for many years after. It replaced the earlier AN/GRC-3 through 8 series ...
30 mm M230 chain gun turret on a Boeing AH-64 Apache being aimed with a helmet-mounted sight. A helmet-mounted display ( HMD) is a headworn device that uses displays and optics to project imagery and/or symbology to the eyes. [ 1][ 2][ 3] It provides visual information to the user where head protection is required – most notably in military ...
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