<page_title> HP LaserJet 4000 series </page_title> <section_title> Comparison </section_title> <table> <cell> 4000 <col_header> Model </col_header> </cell> <cell> November 1997 <col_header> Introduction </col_header> </cell> <cell> May 1999 <col_header> Discontinued </col_header> </cell> </table>
The LaserJet 4000 series was introduced in November 1997 and was discontinued in May 1999.