FIELD: pipe engineering. SUBSTANCE: means has housing, facility for moving made up as several propellers (wheels or tracks) with a drive, and facility for pressing the propellers to the surface. The facility for moving is made up only as two propellers 1 and 2 which are in a contact with opposite portions of the surface. The pressing facility is made up as U-shaped plate spring 7 that interconnects them. The arms of the spring are different. EFFECT: improved design. 2 dwg
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