Managing the Transition from Maturity to Decline: Diamond Power Corporation This case study, prepared by Richard C. Scameborn, follows the Diamond Power Specialty Company from its humble beginnings in 1903 to its decline in The birth of Diamond came with the invention of the hand cranked soot blower. As the years and technology progressed, so did the Diamond soot blower. Along with this main product, Diamond also added several other products to its line, but none had the profitability of the soot blower. Diamond had the market to itself for a number of years, but eventually two competitors sprang up to challenge Diamond: Copes-Vulcan