How wind turbine manufacturer implement Product Service System(PSS) as part of their Product portfolio? Explain

Instructions–methodology analysis and finally conclusion.Problem formulation for my project is÷

How wind turbine manufacturer implement Product Service System(PSS) as part of their Product portfolio? for other materials i will pass it later.you can use many internet sources but use at least 3 to 5 books and some really good articles and papers.i need around 45 references(sources)

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