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Double joint chain in a special configuration with an adjustable bending strength and 360 degrees of usable bending angle between two continuously adjacent chain links, in hand friend embodiment it can be designed for use as figs. play apparatus and / or motion therapy apparatus
Double joint chain in a special configuration with an adjustable bending strength and 360 degrees of usable bending angle between two continuously adjacent chain links, in hand friend embodiment it can be designed for use as figs. play apparatus and / or motion therapy apparatus