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2. Christmas tree (oil well) - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_(oil_well)

   Christmas tree (oil well) Oil well Christmas tree. In petroleum and natural gas extraction, a Christmas tree, or tree, is an assembly of valves, casing spools, and fittings used to regulate the flow of pipes in an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well, and other types of well.

3. Christmas tree - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree

   Christmas tree decorated with lights, stars, and glass balls Glade jul by Viggo Johansen (1891) Typical North American family decorating Christmas tree (c. 1970s). A Christmas tree is a decorated tree, usually an evergreen conifer, such as a spruce, pine or fir, or an artificial tree of similar appearance, associated with the celebration of Christmas.

4. Christmas tree cultivation - Wikipedia

   en.wikipedia.org/wiki/Christmas_tree_cultivation

   Christmas tree cultivation is an agricultural, forestry, and horticultural occupation which involves growing pine, spruce, and fir trees specifically for use as Christmas trees. The first Christmas tree farm was established in 1901, but most consumers continued to obtain their trees from forests until the 1930s and 1940s.

5. Christmas pickle - Wikipedia

   en.wikipedia.org/wiki/Christmas_pickle

   Christmas pickle. The Christmas pickle is an American Christmas tradition. A decoration in the shape of a pickle is hidden on a Christmas tree, with the finder receiving either a reward or good fortune for the next year. There are a number of different origin stories attributed to the tradition, including one originating in Germany.

6. NGC 2264 - Wikipedia

   en.wikipedia.org/wiki/NGC_2264

   NGC 2264 is the location where the Cone Nebula, the Stellar Snowflake Cluster and the Christmas Tree Cluster have formed in this emission nebula. For reference, the Stellar Snowflake Cluster is located 2,700 light years away in the constellation Monoceros. The Snowflake Cluster was granted its name due to its unmistakable pinwheel-like shape ...

7. Aluminum Christmas tree - Wikipedia

   en.wikipedia.org/wiki/Aluminum_Christmas_tree

   A vintage aluminum Christmas tree. An aluminum Christmas tree is a type of artificial Christmas tree that was popular in the United States from 1958 until about the mid-1960s. As its name suggests, the tree is made of aluminum, featuring foil needles and illumination from below via a rotating color wheel . The aluminum Christmas tree was used ...