The case of a 5-year privilege of the nobleman Piotrovsky for the instrument he invented, the "accordometer", for the configurat...

The case of a 5-year privilege of the nobleman Piotrovsky for the instrument he invented, the "accordometer", for the configuration of piano and other musical instruments.N. 1/VII;V.U.14/IX;1845 / Department of State Economy.- 1845. -9 l .. - (Department of state savings of the State Council. Inventory No. 3. 1845).-Film..I. Department of State Economy ..Electronic copy source: RGIAOriginal storage location: RGIA f.1152 op.3 1845 d.110