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2. Trench drain - Wikipedia

   en.wikipedia.org/wiki/Trench_drain

   Trench drain. A trench drain (also channel drain, line drain, slot drain, linear drain, or strip drain) is a specific type of floor drain containing a dominant trough- or channel-shaped body. It is used for the rapid evacuation of surface water or for the containment of utility lines or chemical spills. Employing a solid cover or grating that ...

3. Manhole cover - Wikipedia

   en.wikipedia.org/wiki/Manhole_cover

   Manhole cover - Wikipedia ... Manhole cover

4. Stainless steel - Wikipedia

   en.wikipedia.org/wiki/Stainless_steel

   Stainless steel - Wikipedia ... Stainless steel

5. Storm drain - Wikipedia

   en.wikipedia.org/wiki/Storm_drain

   Storm drain - Wikipedia ... Storm drain

6. Sink - Wikipedia

   en.wikipedia.org/wiki/Sink

   Sink - Wikipedia ... Sink

7. Grating - Wikipedia

   en.wikipedia.org/wiki/Grating

   The grating profile is the function of the reflectance or transmittance perpendicular to the lines. This function is generally a square wave, in that every transition between lines is abrupt. A grating can be defined by six parameters: Spatial frequency is the number of cycles occupying a particular distance (e.g. 10 line pairs per millimeter).