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Self-publishing is not a new phenomenon but has been around since the invention of writing. After the invention of the printing press by Johannes Gutenberg in 1440, numerous books have been
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Discussing cast steel vs ductile iron by Dandong Foundry in China, including their comparision to chemical, mechanical properties, and production process and costs.
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Micrometers A micrometer, also known as micrometer screw gauge, is a device widely used in mechanical engineering for precisely measuring thickness of blocks, outer and inner diameters of shafts and depths of slots.