Equipment and supplies Air conditioning -- 2 Heating -- 2 Automobiles -- 1 Chemical plants -- 1 Computers -- 1 Maintenance and repair 1 more ... Maintenance and repair -- 1 Microcomputers -- 1 Photography -- 1 Photojournalism 1 Photojournalism -- 1 Polymers 1 Radio -- 1 Recording and reproducing -- 1 Sound -- 1 Tools 1 Ventilation -- 1 Vocational guidance 1 less ...