Inventive step
(Conclusion)
Inventive step is found (Claim 2).
There is no incentive to apply only a part of the secondary cited invention to the main cited invention.
<Writer: Hideki Takaishi (Attorney-at-law licensed in Japan and California)>
https://www.courts.go.jp/ip/eng/assets/ip/eng/chizai_en/chizai_en-pdf-2931.pdf