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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. Coining (metalworking) - Wikipedia

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

   Coining can be done using a gear driven press, a mechanical press, or more commonly, a hydraulically actuated press. Coining typically requires higher tonnage presses than stamping, because the workpiece is elastically deformed and not actually cut, as in some other forms of stamping. The coining process is preferred when there is a high tonnage.

4. Stamp mill - Wikipedia

   en.wikipedia.org/wiki/Stamp_mill

   Small stamps were commonly powered by water wheels and larger ones by steam engines. Californian stamps were based on Cornish stamps and were used for the Californian gold mines. In these stamps the cam is arranged to lift the stamp from the side, so that it causes the stamp to rotate. This evens the wear on the shoe at the foot of the stamp.

5. Bureau of Engraving and Printing - Wikipedia

   en.wikipedia.org/wiki/Bureau_of_Engraving_and...

   The first of the works printed by the BEP was placed on sale on July 18, 1894, and by the end of the first year of stamp production, the BEP had printed and delivered more than 2.1 billion stamps. The United States Postal Service switched purely to private postage stamp printers in 2005, ending 111 years of production by the Bureau.

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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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