yellow hard plastic safety helmets sit on work desks in office intended for architects and engineers to wear when entering

helmets safety architect blueprint businessperson conceptual contractor control corporate document employment engineer engineering foreman hardhat hat helmet occupation plan prevention professional project protect protection team worker workplace apprenticeship build construction site employed hard headgear plastic protective work business yellow architecture equipment builder head industry job background businessman calculation concept design health structure sit desks office intended architects engineers wear entering sites precaution hats