Frederick Jones did NOT invent the refrigerated truck. His invention is credited to the 1930s, while they actually go back to the 1920s. Link in a reply to this comment. (Put separate to avoid YouTube deletion of this parent comment.) -- Mechanically refrigerated trucks (blackinventionmyths.com)
ADDENDUM: The fellow made another such video, but actually repeats the mistake: Debunking '15 Inventions Created By Black Americans’ - YouTube