Sweden

The Swedish patent office at the time of early aviation was . . . and the current one is . . . .

SV is an abbreviation in this wiki referring to Sweden (Sverige).

Regarding military aeronautics:

Sweden had a similar experience to that of Roumania and the Netherlands. In 1897 a corps was formed in the fortress of Vaxholm, and material was supplied by the firms of Godard and Surcouf, in Paris. In 1900 an officer was sent to Versailles to study the French methods of instruction. A year later Lieutenant Saloman was sent to Vienna for a similar purpose, and in 1905 Lieutenant von Rosen was attached for several months to the corps stationed at Berlin. A balloon-ship was introduced in the Swedish Navy in 1903, intended for purposes of coast defense. It carried a German kite-balloon of a capacity of 25,000 cubic feet, which is filled with hydrogen, produced electrolytically, and compressed in cylinders.