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![Understanding controllers and looking into the future | The Magazine For Professional Window Cleaners Understanding controllers and looking into the future | The Magazine For Professional Window Cleaners](https://i0.wp.com/www.windowcleaningmagazine.co.uk/wp-content/uploads/2018/03/Screen-Shot-2018-03-01-at-3.38.43-PM.png?fit=1024%2C611&ssl=1)