Historedia
Person

Karl Demian

Events
1
Episodes
2
Years
1829

Every event in Historedia whose sources name Karl Demian, with the role they cite and all of that event’s episodes. This is not a biography, and mentions are grouped by name, so two people with the same name can share this page.

Events and episodes

  1. Cyrill Demian's accordion patent application in Vienna

    1829

    Role: Son and Collaborator

    1. May 6, 1829 · ViennaPatent Presentation

      Cyrill Demian and his sons presented the accordion to Vienna authorities on May 6, 1829, for patent approval.

    2. May 23, 1829 · ViennaPatent Grant

      The patent for the accordion was officially granted on May 23, 1829, following the initial presentation.

Sources

  1. Cyrill Demian Wikipedia, revision of 2026-03-30