A mechanic is a skilled tradesperson who uses tools to build, maintain, or repair machinery, especially cars.
A mechanic at a steam pump in an electric power house, 1920, (from a photo study for the Works Progress Administration (WPA)).
A tradesperson or tradesman/woman is a skilled worker that specialises in a particular trade. Tradesperson (tradesman/woman) usually gain their skills through work experience, on-the-job training, an apprenticeship program or formal education.
Welder
A tradesmen's entrance in London