English: All these "mechanized rakes" are machines that are drawn by draft animals or tractors, and are used to collect hay in more or less linear piles (windrows). Imprecisely they are called hay rakes (generic term).
English: Different types of "rakes" are used in sewage treatment, at river weirs, etc. to collect floating refuse (e.g. wood, leaves, debris). – Help with proper English naming of these devices is welcome.