Build? a model perhaps. Google the product. Go to your fire rescue station ask them if they would demonstrate. or perhaps watch a training video they use. It's a heavy very powerful
hydraulic tool. there is a tool used for Circlip retention ring
which has an action of a "reverse" pliers. When you squease
the handle it opens instead of closes. The jaws of life have a similar action. Do some more searches perhaps you will find a video on youtube of the tool in action.
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