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Continue to ChatPatent: EF 16-35 f/4L, 17-40 f/4L and Others https://www.canonrumors.com/patent-ef-16-35-f4l-17-40-f4l-and-others/
Patent: EF 16-35 f/4L, 17-40 f/4L and Others https://www.canonrumors.com/patent-ef-16-35-f4l-17-40-f4l-and-others/