books.google.se - This book explores both the technology and marketing decision-making in a world-wide industry where product purchasers represent long-term decisions and where the rate of change of the technology has been incredibly rapid. The context in which switching systems were developed and deployed is sometimes...http://books.google.se/books/about/100_Years_of_Telephone_Switching.html?hl=sv&id=07NmhqkOqwsC&utm_source=gb-gplus-share100 Years of Telephone Switching
