/ http://www.slideshare.net/images/logo.gif / 際際滷Share feed for 際際滷shows by User: esakerttula https://cdn.slidesharecdn.com/profile-photo-esakerttula-48x48.jpg?cb=1667666748 Prof-Tel Oy Ltd is a telecommunications business and information technology consulting company founded by Dr. Esa Kerttula in 1991. See more in www.proftel.fi. http://www.proftel.fi