The case of the privilege of Wulfs for the improvement in the device of the piano.N. 5/I;V.U.27/I.1839

The case of the privilege of Wulfs for the improvement in the device of the piano.N. 5/I;V.U.27/I.1839 / Department of State Economy.- 1839. -9 l .. - (Department of state savings of the State Council. Inventory No. 2. 1839).-Film..I. Department of State Economy ..Electronic copy source: RGIAOriginal storage location: RGIA f.1152 op.2 1839 d.9