Notwithstanding the provisions of § 9-19b, during the period between the last session for the admission of electors prior to an election and the opening of the limited session for such admission held on the last weekday before the election, the town clerk or assistant town clerk during office hours and at the office of such official, and either registrar of voters or a deputy or assistant registrar at the office of such official, may examine the qualifications of any person applying in person to be admitted as an elector in such town and act on such application, except the privileges of an elector shall not attach to any such applicant until written approval is sent to him by such official no earlier than two days following the election. If the application is disapproved, such official shall send notification thereof by certified mail no earlier than two days following the election. At the time of application, the official examining the applicant shall retain a copy of the application and shall hand a receipt thereof to the applicant.