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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   A sewer pipe is normally at neutral air pressure compared to the surrounding atmosphere.When a column of waste water flows through a pipe, it compresses air ahead of it in the system, creating a positive pressure that must be released so it does not push back on the waste stream and downstream traps, slow drainage, and induce potential clogs.

3. Planter (farm implement) - Wikipedia

   en.wikipedia.org/wiki/Planter_(farm_implement)

   A two row planter featuring John Deere "71 Flexi" row units John Deere MaxEmerge XP Planter with Case IH AFS precision farming system which auto-steers using GPS A Kinze 2200 planter. A planter is a farm implement, usually towed behind a tractor, that sows (plants) seeds in rows throughout a field.

4. Pit latrine - Wikipedia

   en.wikipedia.org/wiki/Pit_latrine

   A cat hole is a one-time-use pit toilet often utilized by campers, hikers and other outdoor recreationalists. Also referred to as the "cat method," it is formed by simply digging a hole in the ground just large enough to hold the feces from one defecation event. After use, the hole is refilled with the soil that was dug out.

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

6. Tile drainage - Wikipedia

   en.wikipedia.org/wiki/Tile_drainage

   Tile drainage is a form of agricultural drainage system that removes excess sub-surface water from fields to allow sufficient air space within the soil, proper cultivation, and access by heavy machinery to tend and harvest crops.

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   AOL latest headlines, entertainment, sports, articles for business, health and world news.