BUILT-UP PISTON OIL RING von SHTEJNBERG EDUARD I,SU, LEONIDOV GEORGIJ L,SU, PIKMAN ANATOLIJ R,SU, RYVKIN VLADIMIR L,SU, MOLDAVANOV VIKTOR P,SU

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ARRANGEMENT FOR ERECTING COMPOSITE FACING OF OPERATIVE TUNNELS DURING RECONSTRUCTION von SKOBELKIN OLEG A,SU, BOBROVSKIJ LEV M,SU, SHTEJNBERG MIKHAIL YA,SU, KLETSKO VALENTIN S,SU, KRASNOPEROV NIKOLAJ S,SU, ROSHAL EDUARD E,SU, LEMASOV LEONID I,SU, SIDORENKO ALEKSANDR G,SU

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APPARATUS FOR ERECTING PREFABRICATED LINING OF OPERATING TUNNELS BEING RECONSTRUCTED von SKOBELKIN OLEG A,SU, BOBROVSKIJ LEV M,SU, SHTEJNBERG MIKHAIL YA,SU, KLETSKO VALENTIN S,SU, KRASNOPEROV NIKOLAJ S,SU, ROSHAL EDUARD E,SU, LEMASOV LEONID I,SU, SIDORENKO ALEKSANDR G,SU

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