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"PERFECTED SCRUB DEVICE", characterized by being formed by two complementary parts: the scrubber itself and the draining device, the first consisting of a rectangular plate whose bottom is joined by glue insoluble in water and in the media ordinary cleaning, a sponge parallelepiped, while the upper part are fixed with screws two plates that serve as support to an axis, on which rotates, in the medium perpendicular plane, a tubular body, to which the handle is attached, provided with a coupling means that forms an acute descending angle with it being coated the shaft at its ends of rubber sleeves, serving as a brake preventing free movement of rotation between the two parts. (Machine-translation by Google Translate, not legally binding)
A plane problem of the theory of elasticity of heterogeneous media(Plane problem for inhomogeneous elastic media based on assumption of elastic coefficients as functions of two variables defined in domain occupied by medium)