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| Machine weld
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Faster and more exact than manual welding, these metals are fused together by melting at the surface to be joined and by the addition of filler metal. |
| Machine-tooled finish limestone
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Limestone blocks with a grooved finish of four to eight parallel grooves per inch, which are used for decoration. |
| Machinery
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(1) A combination of things, which keep something in action. (2) The working parts of any machine. (3) More than one machine. |
| Macro
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Meaning long, large or expanded and is used often as a prefix to a term to point out the large, expanded use of the term. |
| Madison clips
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Thin metal clips which are used in older work places to attach switches and receptacles. |
| Magma
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Molten or partially molten rock at temperatures ranging from 1,260 F to 2,880 F (700 C to 1600 C). Some magma bodies are believed to exist at drillable depths within the Earth's crust, although practical technologies for harnessing magma energy have not been developed. If ever utilized, magma represents a potentially enormous resource. |
| Magnesium
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One of the elements in the earth's crust, the compounds of which when dissolved in water make the water hard. The presence of magnesium in water is a factor contributing to the formation of scale and insoluble soap curds. |
| Magnet
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Material containing the property of attaining iron or steel and also produces an exterior magnetic field of energy. |
| Magnet, permanent
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An iron type of material, which retains the magnetism, it has been given rather than requiring electrical power to maintain a magnetic field. |
| Magnetic ballast
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A type of florescent light ballast that uses a magnetic core to regulate the voltage of a florescent lamp. |
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