MAINTENANCE AGREEMENT FOR PANALYTICAL XRD PW 1800; QUOTE : USQ11472; DATED JUNE 28, 2007; CONTACT: MARYANN TOGNAZZI, CONTRACT ADMINISTRATOR; 508-647-1199; FAX: 508-647-1117; PANALYTICAL, INC., 12 MICHIGAN DR., NATICK, MA 01760: