A piping system is generally considered to include the complete interconnection of pipes, including in-line components such as pipe fittings and flanges
The lock engages a bolt inside the door. This piece of metal extends from the door into the frame and holds it closed
The overlock machine is different from the lockstitch sewing machine, cut the edge of fabrics, and cover two parts of fabrics by stitching
a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit
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