user: Question: who is the the womens singles with mixed doubles being Bernd Frohnwieser Hilde Themel and year being smaller than 1959.0
Columns: ['Year', 'Mens singles', 'Womens singles', 'Mens doubles', 'Womens doubles', 'Mixed doubles']
Types: ['real', 'text', 'text', 'text', 'text', 'text']
Sample row: [1958.0, 'Helmut Kraule', 'Lotte Heri', 'Valentin Taupe August Woschitz', 'Hilde Taupe Anni Taupe', 'Bernd Frohnwieser Hilde Themel']
SQL:

assistant: SELECT "Womens singles" FROM "Table" WHERE "Mixed doubles" = 'Bernd Frohnwieser Hilde Themel' AND "Year" < 1959.0;