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Heavy equipment - Hydraulic machines Documentary - World Geographic Channel The popularity of hydraulic machinery is due to the very large amount of power that can be transferred through small tubes and flexible hoses, and the high power density and wide array of actuators that can make use of this power. Hydraulic machinery is operated by the use of hydraulics, where a liquid is the powering medium. Read More: https://en.wikipedia.org/wiki/Hydraulic_machinery Click Here To Subscribe https://www.youtube.com/channel/UC4q7qhhvQL2O-GS4BUmU5zQ