The case of the privilege of the piano master Grinwald for the improvement in the piano mechanism done by him.N. 8/II;V.U.1/II;1...

The case of the privilege of the piano master Grinwald for the improvement in the piano mechanism done by him.N. 8/II;V.U.1/II;1837./ Department of State savings.- 1837. -9 l .. - (Department of state savings of the State Council. Inventory No. 2. 1837).-Film..I. Department of State Economy ..Electronic copy source: RGIAOriginal storage location: RGIA f.1152 op.2 1837 d.7