Core technical capability is the ability of an enterprise to create a technology with its own characteristics through unique technical elements and skills or a unique combination of various elements and skills to generate scarce, non-imitable technical resources (including technology and knowledge, etc. ). According to the above definitions, which of the following is that does not belong to the core technical capabilities of the enterprise? ['Google holds key technologies for web search.', 'Microsoft has mastered the technology of operating system development.', 'The original IBM company mastered the manufacturing technology of large supercomputers.', 'Lenovo holds personal computer manufacturing technology.']