FIELD: construction.
SUBSTANCE: device has the central rib (1) in the form of receiving element for all mounted in accordance with the modular structure of hinged and plug-in elements. The device contains the recess (8) oriented horizontally and opened upward for the display (9), performed with ability to rotate for using the device in the same orientation in two directions.
EFFECT: increased reliability and efficiency of the device, when screwing the bolts and nuts.
23 cl, 7 dwg
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