hello dear technician tungnhung l'm your friend zaza ..so l invited you dear friend in our group of technician in copiers machine ...well now our group have 20th technician and l thing you are the 21th in our group ..well our group have many advantage ...collaborate ..assisiated ..healpeness and ..echanging free manual together for her mamber ..so if you need have any more information with our group ..this is my mail mecanopharme@hotmail.fr