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Wave soldering — is a large scale soldering process by which electronic components are soldered to a printed circuit board (PCB) to form an electronic assembly. The name is derived from the use of waves of molten solder to attach metal components to the PCB. The… … Wikipedia
traditional ceramics — Introduction ceramic materials that are derived from common, naturally occurring raw materials such as clay minerals and quartz sand. Through industrial processes that have been practiced in some form for centuries, these materials are made … Universalium
Martin Marietta Materials — Type Public (NYSE: MLM) Industry Construction Materials Founded … Wikipedia
Blacksmith — For other uses, see Blacksmith (disambiguation). Blacksmith A blacksmith at work Occupation … Wikipedia
Silurian Period — Interval of geologic time, 443–417 million years ago. The third period of the Paleozoic Era, the Silurian follows the Ordovician Period and precedes the Devonian. It marks the first appearance of land plants and jawed fishes. The continents were… … Universalium
Sedgefield — ▪ district, England, United Kingdom borough (district), administrative and historic county of Durham, northeastern England, occupying a limestone plateau generally 300 to 400 feet (90 to 120 metres) in elevation between the Pennine uplands… … Universalium

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