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2. Stamping (metalworking) - Wikipedia

   en.wikipedia.org/wiki/Stamping_(metalworking)

   Stamping (also known as pressing) is the process of placing flat sheet metal in either blank or coil form into a stamping press where a tool and die surface forms the metal into a net shape. Stamping includes a variety of sheet-metal forming manufacturing processes, such as punching using a machine press or stamping press , blanking, embossing ...

3. Stamp mill - Wikipedia

   en.wikipedia.org/wiki/Stamp_mill

   Stamp mills are still in use in Colombia by artisanal miners, powered by electric motors. Eight heads of Cornish stamps powered by a waterwheel A five unit Californian stamp mill once used in Arizona for crushing copper ore. Cornish stamps are stamp mills that were developed in Cornwall for use in tin mining in around 1850. Cornish stamps were ...

4. Metal prices - Wikipedia

   en.wikipedia.org/wiki/Metal_prices

   Metal prices are the prices of metal as a commodity that are traded in bulk at a predefined purity or grade. Metal can be split into three major categories, precious metals, industrial metals and other metals. Precious metals and industrial metals are priced by trading of those metals on commodities exchanges. [1]

5. List of Machin stamps - Wikipedia

   en.wikipedia.org/wiki/List_of_Machin_stamps

   The 7d, 8d and 9d stamps had the value indicator behind the bust. [8] 8d Vermillion 8d Light turquoise blue 6 Jan 1969 [6] 9d Dark green 8 Aug 1967 [3] 10d Drab 1 Jul 1968 [7] The background of the 10d and 1/- stamps had a gradient. 1/- Pale violet 5 Jun 1967 [4] 1/6 Blue and deep blue 8 Aug 1967 [3] 1/9 Orange and black 5 Jun 1967 [4] 2/6 Peat ...

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7. Postage stamps and postal history of the United States

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

   Each stamp was hand engraved in what is believed to be steel, and laid out in sheets of 200 stamps. The 5-cent stamp is often found today with very poor impressions because the type of ink used contained small pieces of quartz that wore down the steel plates used to print the stamp. On the other hand, most 10-cent stamps are of strong impressions.

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