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  2. Columbian Issue - Wikipedia

    en.wikipedia.org/wiki/Columbian_Issue

    The 2¢ Landing of Columbus is the most common stamp of the Columbian Issue. The Columbian Issue, also known as the Columbians, is a set of 16 postage stamps issued by the United States to commemorate the World's Columbian Exposition held in Chicago during 1893.

  3. List of building materials - Wikipedia

    en.wikipedia.org/wiki/List_of_building_materials

    This is a list of building materials. Many types of building materials are used in the construction industry to create buildings and structures . These categories of materials and products are used by architects and construction project managers to specify the materials and methods used for building projects .

  4. Postage stamps and postal history of the United States

    en.wikipedia.org/wiki/Postage_stamps_and_postal...

    The 5-cent stamp paid for a letter weighing less than 1/2 ounce and traveling up to 300 miles, the 10-cent stamp for deliveries to locations greater than 300 miles, or, twice the weight deliverable for the 5-cent stamp. Each stamp was hand engraved in what is believed to be steel, and laid out in sheets of 200 stamps.

  5. Bracket (architecture) - Wikipedia

    en.wikipedia.org/wiki/Bracket_(architecture)

    In adjustable shelving systems, the bracket may be in two parts, with the load-bearing horizontal support fitting into a wall-mounted slotted vertical metal strip. Brackets also are an element in the systems used to mount modern facade cladding systems onto the outside of contemporary buildings, as well as interior panels.

  6. Transfer stamping - Wikipedia

    en.wikipedia.org/wiki/Transfer_stamping

    Stamping Process coil, blank, draw, trim, flange. Sheet metal forming in medium-high volume production environments is often completed through the use of a Transfer Press operating a number of dies as a complete system. Each die in the system is responsible for adding more shape to the part until the metal work piece attains its final shape.

  7. 1939 New York World's Fair - Wikipedia

    en.wikipedia.org/wiki/1939_New_York_World's_Fair

    The buildings included design features such as domes, spirals, buttresses, porticos, rotundas, tall pylons, and corkscrew-shaped ramps. [286] [287] Many buildings' steel frames were bolted together so they could be easily disassembled. [263] [284] Most of the attractions were in the central exhibit area, covering 390 acres (160 ha).

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