Column move in 2 or 3 such x, y truc x, y, z.The head was spinning at every key dèn position or according to the fixed angle.Fixed position by key wins from or by the mechanics.The column contains the system.The format columns carry the ball:The form of hanging ceiling (Ceiling Tube Support), this system is very expensive and very complicated when assembled.The form of the Assembly on the floor or desk with integrated capture patient. This column type is cheap, easy to assemble and needs no installation.
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