![An-azimuthal-view-of-a-worker-tightening-a-bolt-on-an-aluminum-photovoltaic-panel-support-rail-on-a-slightly-rusted-roof](https://videocdn.cdnpk.net/videos/dfd430d1-e1ff-4aaa-9302-51f876f34c37/horizontal/thumbnails/small.jpg)
An azimuthal view of a worker tightening a bolt on an aluminum photovoltaic panel support rail on a slightly rusted roof
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