If any area becomes subject to a board of election commissioners by reason of annexation to a city, village or incorporated town subject to such a board or ceases to be subject to a board of election commissioners by reason of disconnection from such a city, village or incorporated town, it shall not be necessary for the registered voters in such area to register again, either under this Article or Article 6.
     As soon as practicable after such annexation or disconnection, the county clerk or board of election commissioners, as the case may be, shall turn over to officer or officers thereafter to be charged with the registration of voters within the area affected (the board of election commissioners or county clerk, as the case may be) the original and duplicate registration cards of all registered voters in the annexed or disconnected area.