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Scaffolding
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===Pump-jack=== A pump-jack is a type of portable scaffolding system. The scaffold rests on supports attached to two or more vertical posts. The user raises the scaffolding by pumping the foot pedals on the supports, like an automobile [[jack (device)|jack]].<ref>{{cite web|url=https://www.osha.gov/SLTC/etools/scaffolding/supported/pumpjack.html|title=Scaffolding eTool - Supported Scaffolds - Pump Jack - Occupational Safety and Health Administration|website=www.osha.gov|access-date=6 July 2017}}</ref>
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