Question: What nationality was the man in whose shops Henri Maillardet spent a period of time?
Sentence (from "African immigrants to Switzerland"): According to official Swiss population statistics, 73,553 foreigners with African nationality lived in Switzerland as of 2009 (0.9% of total population, or 4.3% of resident foreigners — this data excludes immigrants with African ancestry coming from other parts of the world: Dominican Republic, Brazil, United States, Cuba etc.).
Relevant evidence: No