Question: The International Movement for an Imaginist Bauhaus was a small European avant-garde artistic tendency that arose out of the breakup of a movement active between which years ?

Context paragraphs:
Fronte Nuovo delle Arti: Fronte Nuovo delle Arti was an Italian artistic movement active in Venice, Rome and Milan in the years following WWII (1946 to 1950).  It is considered to be part of the post-cubism movement.

COBRA (avant-garde movement): COBRA (or CoBrA) was a European avant-garde movement active from 1948 to 1951.  The name was coined in 1948 by Christian Dotremont from the initials of the members' home cities: Copenhagen (Co), Brussels (Br), Amsterdam (A).

Havířov railway station: Havířov railway station is a train station in Havířov, Czech Republic.  Its main building is one of the best examples of the Czechoslovak avant-garde artistic movement known as the "Brussels style" of the 1960s.

Verbovka Village Folk Centre: Verbovka Village Folk Centre was an artisan cooperative in the village of Verbovka founded by Natalia Davidova in the Ukrainian province of Kiev.  Natalia Davidova, one of the founders and the head of the Kiev Folk Center, was an Avant-garde artist descended from the ancient Ukrainian Hudim-Levkovichis family (Russian philosopher Nikolai Berdyaev was her cousin and artist Nina Genke-Meller was his sister-in-law).  The beginning of the cooperation of Natalia Davidova and Nina Genke-Meller originated not just from their family relations.  They both were keen on folk art and were devoted to the idea of implementation of Avant-garde artistic principles into practice of amateur goods.  In 1915 Nina Genke became a head and chief artist of Natalia's Davidova Folk Center in Verbovka village.  N.Davidova involved Nina Genke in "promoting " folk thing's production in accordance with the sketchers of famous Avant-garde artists.  The members of the "Supremus" group started to cooperate very actively.  Between 1915 and 1916 many Suprematist artists such as Kazimir Malevich, Aleksandra Ekster, Nina Genke-Meller, Nadezhda Udaltsova, Liubov Popova, Olga Rozanova, Ivan Puni, Ksenia Boguslavskaya, Ivan Kliun and others worked with peasant artisans at the cooperative.  In November 1915 N.Davidova, together with A.Ekster and N.Genke, arranged an "Exhibition of Modern Decorative Art of the South of Russia" in Lamersie Moscow Gallery.  There they represented the village ladies' works who studied decorative art in Verbovka and Skoptsi's schools, as well as carpets, pillows, shawls and belts made in accordance with sketches of Popova, Malevich, Davidova, Genke, Ekster, Puni, Kliun, Pribilskaya, Yakulov, Rozanova, Vasilieva, Boguslavskaya and others.  The exhibition received broad publicity in the press.  In 1917 Davidova and Genke arranged the "Second Exhibition of Modern Decorative Art" in Moscow in Mikhailava's Saloon.

Triadisches Ballett: Triadisches Ballett (Triadic Ballet) is a ballet developed by Oskar Schlemmer.  It premiered in Stuttgart, on 30 September 1922, with music composed by Paul Hindemith, after formative performances dating back to 1916.  The ballet became the most widely performed avant-garde artistic dance and while Schlemmer was at the Bauhaus from 1921 to 1929, the ballet toured, helping to spread the ethos of the Bauhaus.

Nestor Basterretxea: Nestor Basterretxea Arzadun (6 May 1924 – 12 July 2014) was a Basque artist, born in Bermeo, Biscay.  In the 1950s and '60s, he spearheaded along with other artists such as Jorge Oteiza, Remigio Mendiburu, or Eduardo Chillida, an avant-garde artistic movement concerned with the crisis of Basque identity, and formally a special focus on large volumes and the concept of emptiness.

International Movement for an Imaginist Bauhaus: The International Movement for an Imaginist Bauhaus was a small European avant-garde artistic tendency that arose out of the breakup of COBRA, and was initiated by contact between former COBRA member Asger Jorn and Enrico Baj and Sergio Dangelo of the Nuclear Art Movement.

Small European Postal Administration Cooperation: The Small European Postal Administration Cooperation (SEPAC; also "...Cooperations"; also Small European Postal Administrations Cooperation) is an association of 14 European postal authorities: Åland, the Faroe Islands, Gibraltar, Greenland, Guernsey, Iceland, the Isle of Man, Jersey, Liechtenstein, Luxembourg, Malta, Monaco, San Marino and Vatican City.  Luxembourg was not originally a member of SEPAC but it joined at the end of 2006.  SEPAC is smaller than PostEurop.

Trotskyist Fraction – Fourth International: The Trotskyist Fraction – Fourth International is an international association of Trotskyist organizations that claims to follow the political legacy of the Fourth International and aims to reforge it.  It was formed by groups which arose as the "Internationalist Bolshevik Fraction" within the IWL-FI in 1989.  Regarded at first as an "external fraction" who had been wrongly expelled from 1988 to 1990, the PTS had three splits: first when a number of militants returned to the MAS, then when another group of militants sympathized with the British Workers Revolutionary Party (Worker Press) and the third when supporters of León Pérez (former member of the International Secretariat of the IWL) decided to follow a mass party perspective (as opposed to a vanguard party).  These splits forced the PTS to make a balance and self-criticism, resulting in a further development that mainly questioned the update of the Transitional Program (the so-called the "Theory of Democratic Revolution") that the leader of the IWL Nahuel Moreno made, understanding it as an opposition to Leon Trotsky's Theory of Permanent Revolution.  In 1993 it emerged as the Trotskyist Fraction - International Strategy, founded by the PTS of Argentina, the LTS of Mexico, the LOR of Bolivia and with the additions of the Estratégia Revolucionaria ("Revolutionary Strategy") group of Brazil and the Clase contra Clase ("Class against Class") group of Chile as well as some militant sympathizers in Europe.  In 2004, in its second international conference, coinciding with the congress of the Movement for the Refoundation of the Fourth International also met in Buenos Aires, the FT decided to change the name "International Strategy" to "Fourth International".  Following the economic crisis and demonstrations in several countries, the FT-CI has grown in Latin America and Europe and now promotes the formation of a new grouping: An International Movement for a Socialist Revolution - Fourth International.

Water Yam (artist's book): Water Yam is an artist's book by the American artist George Brecht.  Originally published in Germany, June 1963 in a box designed by George Maciunas and typeset by Tomas Schmit, it has been re-published in various countries several times since.  It is now considered one of the most influential artworks released by Fluxus, the internationalist avant-garde art movement active predominantly in the 1960s and '70s.  The box, sometimes referred to as a "Fluxbox" or "Fluxkit", contains a large number of small printed cards, containing instructions known as "event-scores", or "fluxscores".  Typically open-ended, these scores, whether performed in public, private or left to the imagination, leave a lot of space for chance and indeterminancy, forcing a large degree of interpretation upon the performers and audience.

Supporting paragraphs: International Movement for an Imaginist Bauhaus COBRA (avant-garde movement)
Answer: 1948 to 1951