Torsion balances , seismographs – Askania-Werke AG.

Laby, Thomas H., Torsion balances , seismographs – Askania-Werke AG. (Undated), [UMA-IT-000047202]. University of Melbourne Archives, accessed 30/04/2026, https://archives.library.unimelb.edu.au/nodes/view/511829