Kongliga Patent-och registreringsverket
The Kongliga Patent-och registreringsverket (Royal Patents & Registrations Agency) was the patent office of Sweden from 1895 onwards. (Sometime between then and now, they may have dropped "Kongliga", Royal; they go by "PRV". "Kongliga" frequently abbreviated to Kongl.)
From 1885–1895 it was the Kongliga Patentbyrån (Royal Patent Office).
- Historia, PRV.
- De Fonvielle, 1885, Les ballons à voile de M. Andrée, p. 125.
- P.J. Capelotti, "Andrée, Salomon August", Encyclopedia of the Arctic, ed. Mark Nuttall; Routledge, 2005; pp. 89–90.