1. A file which has a single set of parallel teeth. 2. A flat, rectangular piece of wood with a handle, used to apply and smooth coats of plaster. 3. A mechanical device to finish the surface of freshly placed concrete paving. 4. A marble-polishing block. 5. Any structure that provides positive buoyancy such as a hollow, watertight unit that floats or rests on the surface of a fluid.

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