|Founder||Harry and Roy Aitken|
| Adolph Zukor (Producer)|
Triangle Film Corporation (also known as Triangle Motion Picture Company) was a major American motion-picture studio, founded in July 1915 in Culver City, California and terminated 7 years later in 1922.
The studio was founded in July 1915 by Harry and Roy Aitken, two brothers from the Wisconsin farmlands who pioneered the studio system of Hollywood's Golden Age. Harry was also D. W. Griffith's partner at Reliance-Majestic Studios; both parted with the Mutual Film Corporation in the wake of The Birth of a Nation 's unexpected success that year.  Triangle was envisioned as a prestige studio based on the producing abilities of filmmakers D. W. Griffith, Thomas Ince and Mack Sennett. 
On November 23, 1915, the Triangle Film Corporation opened a state-of-the-art motion picture theater in Massillon, Ohio. The Lincoln Theater is still an operational movie theater owned and operated by the Massillon Lion's Club. The theater has been restored and is host to a yearly film festival dedicated to the films of Dorothy and Lillian Gish.[ citation needed ]
Eventually, the studio suffered from bloat. By 1917, producer Adolph Zukor had taken control of all of the studio's assets.  In June 1917, Thomas H. Ince and Mack Sennett left the company and sold their remaining interests.  In 1917, Triangle's distribution network of film exchanges were sold off to the W.W. Hodkinson company for $600,000  (equivalent to $13,000,000in 2021). Goldwyn Pictures purchased the Triangle Studios in Culver City in 1918.   
Triangle continued to produce films until 1919, when it ceased operations. Films using the Triangle name were still released to the general public until 1923. 
With the exception of Oh, Mabel Behave (1922), all of Triangle's films were released between 1915 and 1919.  Most films were made on the West Coast, but some of Triangle's production took place in Fort Lee, New Jersey. 
The Fox Film Corporation was an American Independent film production studio formed by William Fox (1879–1952) in 1915, by combining his earlier Greater New York Film Rental Company and Box Office Attractions Film Company.
Mack Sennett was a Canadian-American film actor, director, and producer, and studio head, known as the 'King of Comedy'.
Tillie's Punctured Romance is a 1914 American silent comedy film directed by Mack Sennett and starring Marie Dressler, Mabel Normand, Charlie Chaplin, and the Keystone Kops. The picture was the first feature-length comedy and the first motion picture produced by the Keystone Film Company, and is the only one featuring Chaplin.
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Keystone Studios was an early film studio founded in Edendale, California on July 4, 1912 as the Keystone Pictures Studio by Mack Sennett with backing from actor-writer Adam Kessel (1866–1946) and Charles O. Baumann (1874–1931), owners of the New York Motion Picture Company. The company, referred to at its office as The Keystone Film Company, filmed in and around Glendale and Silver Lake, Los Angeles for several years, and its films were distributed by the Mutual Film Corporation between 1912 and 1915. The Keystone film brand declined rapidly after Sennett went independent in 1917.
Dorothy Dalton was an American silent film actress and stage personality who worked her way from a stock company to a movie career. Beginning in 1910, Dalton was a player in stock companies in Chicago; Terre Haute, Indiana; and Holyoke, Massachusetts. She joined the Keith-Albee-Orpheum Corporation vaudeville circuits. By 1914 she was working in Hollywood.
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Alice Howell was a silent film comedy actress from New York City. She was the mother of actress Yvonne Howell.
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Charles Gardner Sullivan was an American screenwriter and film producer. He was a prolific writer with more than 350 films among his credits. In 1924, the magazine Story World selected him on a list of the ten individuals who had contributed the most to the advancement of the motion picture industry from its inception forward. Four of Sullivan's films, The Italian (1915), Civilization (1916), Hell's Hinges (1916), and All Quiet on the Western Front (1930), have been listed in the National Film Registry.
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Gladys Leslie Moore was an American actress in silent film, active in the 1910s and 1920s. Though less-remembered than superstars like Mary Pickford, she had a number of starring roles from 1917 to the early 1920s and was one of the young female stars of her day.
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Charles O. Baumann was an American film producer, film studio executive, and pioneer in the motion picture industry.
Edward Kline Lincoln was an American silent film actor and director. Lincoln appeared in over 65 silent films and was best known for movies like For the Freedom of the World (1917), The Light in the Dark (1922) and The Man of Courage (1922).
The New York Motion Picture Company was a film production and distribution company from 1909 until 1914. It changed names to New York Picture Corporation in 1912. It released films through several different brand names, including 101 Bison, Kay-Bee, Broncho, Domino, Reliance, and Keystone Studios.
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The Dawson Film Find (DFF) was the accidental discovery in 1978 of 372 film titles preserved in 533 reels of silent-era nitrate films in the Klondike Gold Rush town of Dawson City. The reels had been buried under an abandoned hockey rink in 1929 and included lost films of feature movies and newsreels. A construction excavation inadvertently uncovered the forgotten cache of discarded films, which were unintentionally preserved by the permafrost.
Frank Opperman (1861–1922) was an actor in American silent films. In 1916 he was reported to have had a 29 year career on stage and a 7 year film career. Between 1903 and 1907 he appeared three times on Broadway, in Little Lord Fauntleroy, Cashel Byron, and an adaptation of Uncle Tom's Cabin.