ENGINEERING AND LAND SURVEY ‑- ENGINEERS NOT REGISTERED IN WASHINGTON ‑- PRACTICE OF ENGINEERING LICENSES ‑- ENGINEERS NOT REGISTERED IN WASHINGTON ‑- PRACTICE OF ENGINEERING PARTNERSHIP (1) An engineer or engineers not registered to practice within this state may practice engineering in conducting a feasibility study.  (2) An engineer or engineers not registered may not conduct supervisory engineering during construction, with qualifications.  (3) A partnership in which the partners are engineers is a proper organization through which to practice the profession of engineering.