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Nathaniel Baldwin (December 1, 1878 – January 19, 1961) [1] was an American inventor and industrialist, [2] known for his improved telephonic earphone, among other inventions. He was also a supporter of the early Mormon fundamentalist movement.
The first headphones were developed in the late 19th century for use by switchboard operators, to keep their hands free. Initially, the audio quality was mediocre and a step forward was the invention of high fidelity headphones. [3] [4] Headphones exhibit a range of different audio reproduction quality capabilities.
Many pioneering attempts to record and reproduce sound were made during the latter half of the 19th century – notably Édouard-Léon Scott de Martinville 's phonautograph of 1857 – and these efforts culminated in the invention of the phonograph by Thomas Edison in 1877. Digital recording emerged in the late 20th century and has since ...
The First Auto: June 27, 1927 Warner Bros. Synchronized Score Extant Wings [F 3] August 12, 1927 Paramount Famous Lasky Corporation: Synchronized Score Film-only The Bush Leaguer: August 20, 1927 Warner Bros. Synchronized Score Audio-only Slightly Used: September 3, 1927 Warner Bros. Synchronized Score Audio-only [Disc 5 extant] 7th Heaven [F 4]
The Golden Age of Radio, also known as the old-time radio ( OTR) era, was an era of radio in the United States where it was the dominant electronic home entertainment medium. It began with the birth of commercial radio broadcasting in the early 1920s and lasted through the 1950s, when television gradually superseded radio as the medium of ...
The Acousticon's Model 56 was created in the mid-1920s and was one of the first portable hearing aid units, although it was quite heavy. [1] The first wearable hearing aid using vacuum tube technology went on sale in England in 1936, and a year later in the United States. [5] By the 1930s, hearing aids were becoming popular to the public. [3]
History of radio. The early history of radio is the history of technology that produces and uses radio instruments that use radio waves. Within the timeline of radio, many people contributed theory and inventions in what became radio. Radio development began as "wireless telegraphy". Later radio history increasingly involves matters of ...
The National Labor Union (NLU), founded in 1866, was the first national labor federation in the United States. It was dissolved in 1872. The regional Order of the Knights of St. Crispin was founded in the northeast in 1867 and claimed 50,000 members by 1870, by far the largest union in the country.