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| Clasp nail
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U-shaped, heavy-duty staple. |
| Class "a" fire resistance
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The highest fire-resistance rating for roofing per astm e-108. Indicates that roofing is able to withstand severe exposure to fire originating from sources outside the building. |
| Class "b" fire resistance
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Fire-resistance rating that indicates roofing material is able to withstand moderate exposure to fire originating from sources outside the building. |
| Class "c" fire resistance
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Fire-resistance rating that indicates roofing material is able to withstand light exposure to fire originating from sources outside the building. |
| Class action
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Lawsuit brought by one or more persons of a large group for benefit of all members of that group. |
| Class m buildings
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Classification by the National Frame Builders Association of farm buildings, which are used for livestock, machinery storage, etc. |
| Classified property tax
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Tax rate that varies depending on the usage of the property in question. |
| Clastic
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Rock that consists of fragments of older rocks. |
| Claw
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Two-tined curved end on a bar or hammer head, which is used to grip and pull. |
| Claw hammer
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Hammer with one end of the head forked and curved like a claw to pull out nails. |
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