RU10118U1 RU98103935U RU98103935U RU10118U1 RU 10118 U1 RU10118 U1 RU 10118U1 RU 98103935 U RU98103935 U RU 98103935U RU 98103935 U RU98103935 U RU 98103935U RU 10118 U1 RU10118 U1 RU 10118U1 Authority RU Russia Prior art keywords grate base fasteners agglomerate holes Prior art date Application …