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| Main girder
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A large, timber or steel beam used for supporting the joists of a floor or the framework of a building. |
| Main hoist
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The primary hoist of a large crane which would also have an additional hoist who can be used for smaller loads or whenever a large hoist is not necessary. It also helps to control the large loads of the primary hoist. |
| Main runner
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When installing a suspended ceiling, the main runner is the metal support, running the full length of a room to hold the cross tees which bridge the runners which are supported by wire attached to the old ceiling or over head beams. |
| Main vent
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Principal vent ot which branch vents may be connected. |
| Main water shut-off valve
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Primary valve, used to stop the flow of water, between the water meter and the home. |
| Maintain
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(1) To keep up or continue with something. (2) To keep in a certain condition or position. |
| Maintain contact switch
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Electrical switch wired so that there are two switch positions from which two different modes can be run, such as high and low. A third position opens the switch so that current cannot flow, so that it functions as an on/off switch. |
| Maintenance
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Periodic expenditure needed to preserve a property's original status rather than to improve that property. Activity required to compensate for wear and tear. |
| Maintenance bond
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Warranty bond given to guarantee that the necessary work will be done by the contractor doing repairs. This type of bond normally has a specific period of time. |
| Maintenance fee
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Monthly assessment by homeowner's association on owners and used for maintenance and repair of common areas. |
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