The standard equipment uses a unique patented boom kinematics system. Its false
parallelogram mechanism means it can be elevated when it is front of the apron
(for example, to pass over safety grids) whilst keeping a very low overall height
when the boom is folded.
off. website :
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Other
than its compactness, this kinematics system makes it possible to lift loads
almost vertically. For this reason, the boom does not need to be equipped with
a winch in most circumstances.