Notice of the time, place, and scope of each examination shall be given by publication and posting as specified in section 420.07 and by mailing such notice to each applicant upon the appropriate list of the application register ten days in advance. The names of those found eligible upon examinations after giving credit for character and previous successful experience, shall be entered with their addresses and percentages on the eligible register. No name shall remain upon the eligible register more than two years without a new application and, if the rules of the commission so require, a new examination. When a vacancy has been filled or new appointment made the names selected shall be stricken from the eligible register and transferred to the service register.