Question: What is the date of birth of Olav Heggstad's father?
Sentence (from "Olav Heggstad"): After a few years of employment at the Canal Authority (the forerunner of today's Norwegian Water Resources and Energy Directorate) from 1897 to 1902 as well as the Holmenkollen Line, he studied further at the Dresden University of Technology from 1899 to 1900 to learn more about hydropower and electrical engineering.
Relevant evidence: No