Question: When did Lydia Welti-Escher's father die?
Sentence (from "Alfred Escher"): Thanks to his numerous political posts and his significant role in the foundation and management of the Swiss Northeastern Railway, the Swiss Federal Institute of Technology, Credit Suisse, Swiss Life and the Gotthard Railway, Escher had an unmatched influence on Switzerland's political and economic development in the 19th century.
Relevant evidence: No