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Enamel signs are popular among collectors due to their striking designs and sturdiness. Collecting enamel signs rose in popularity during the late 1970s. [5] Some collectors are interested in signs about gasoline or about domestic products such as tobacco. A sign gets its value by a combination of size, design, condition, and product advertised.
Some of the earliest signs were used informally to denote the membership of specific groups. Early Christians used the sign or a cross or the Ichthys (i.e. fish) to denote their religious affiliations, whereas the sign of the sun or the moon would serve the same purpose for pagans. [7] The use of commercial signage has a very ancient history.
Other terms often used for printed engravings are copper engraving, copper-plate engraving or line engraving. Steel engraving is the same technique, on steel or steel-faced plates, and was mostly used for banknotes, illustrations for books, magazines and reproductive prints, letterheads and similar uses from about 1790 to the early 20th century, when the technique became less popular, except ...
Slag, a byproduct of iron and steel-making composed primarily of highly impure glass, would normally be a waste product. However, it is in demand as an aggregate in concrete, asphalt paving, and construction fill. In 2014, the industry produced and marketed about 16.0 million mt of slag, worth an estimated $270 million. [16]
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Metal fabrication is the creation of metal structures by cutting, bending and assembling processes. It is a value-added [ 1 ] process involving the creation of machines, parts, and structures from various raw materials.
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