class XrayTechnician implements Observer, GenericSubscriber<Geometry> {

    public void close()
    {
        myModel.deleteObserver(this);
        myGeometryRegistry.removeSubscriber(this);
        clearPrevious(New.list());
    }

    public  XrayTechnician(MapManager mapManager, GeometryRegistry geometryRegistry, XrayGogglesModel model);

}