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  2. Messier 19 - Wikipedia

    en.wikipedia.org/wiki/Messier_19

    Messier 19 or M19 (also designated NGC 6273) is a globular cluster in the constellation Ophiuchus. It was discovered by Charles Messier on June 5, 1764 [ 6 ] and added to his catalogue of comet -like objects that same year.

  3. Sheet metal - Wikipedia

    en.wikipedia.org/wiki/Sheet_metal

    In most of the world, sheet metal thickness is consistently specified in millimeters. In the U.S., the thickness of sheet metal is commonly specified by a traditional, non-linear measure known as its gauge. The larger the gauge number, the thinner the metal. Commonly used steel sheet metal ranges from 30 gauge to about 7 gauge.

  4. Steel grades - Wikipedia

    en.wikipedia.org/wiki/Steel_grades

    Steel specified by purpose of use and mechanical properties. ... non-alloy and alloy electrical steel sheet/strip in the semi-processed state ... X5CrNiMo 19 11 ...

  5. Sheet Metal Workers' International Association - Wikipedia

    en.wikipedia.org/wiki/Sheet_Metal_Workers...

    The Sheet Metal Workers' International Association (SMWIA) was a trade union of skilled metal workers who perform architectural sheet metal work, fabricate and install heating and air conditioning work, shipbuilding, appliance construction, heater and boiler construction, precision and specialty parts manufacture, and a variety of other jobs involving sheet metal.

  6. Corrugated galvanised iron - Wikipedia

    en.wikipedia.org/wiki/Corrugated_galvanised_iron

    Corrugated galvanised iron (CGI) or steel, colloquially corrugated iron (near universal), wriggly tin (taken from UK military slang), pailing (in Caribbean English), corrugated sheet metal (in North America), zinc (in Cyprus and Nigeria) or custom orb / corro sheet (Australia), is a building material composed of sheets of hot-dip galvanised ...

  7. Messier object - Wikipedia

    en.wikipedia.org/wiki/Messier_object

    Charles Messier. The first edition of 1774 covered 45 objects (M1 to M45).The total list published by Messier in 1781 contained 103 objects, but the list was expanded through successive additions by other astronomers, motivated by notes in Messier's and Méchain's texts indicating that at least one of them knew of the additional objects.

  8. Youngstown Sheet and Tube - Wikipedia

    en.wikipedia.org/wiki/Youngstown_Sheet_and_Tube

    The Youngstown Sheet and Tube Company, based in Youngstown, Ohio, was an American steel manufacturer. Officially, the company was created on November 23, 1900, when Articles of Incorporation of the Youngstown Iron Sheet and Tube Company were filed with the Ohio Secretary of State at Columbus. In 1905 the word "Iron" was dropped from the company ...

  9. Embossing (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Embossing_(manufacturing)

    Sheet metal embossing is a metalworking process for producing raised or sunken designs or relief in sheet metal. In contrast to coining (which uses unmatched dies), embossing uses matched male and female dies [ 1 ] to achieve the pattern, either by stamping , or by passing a sheet or strip of metal between patterned rollers . [ 2 ]

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