Lens patents

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English translations of Japanese patents can be found at Japan platform for patent information [link].

publication type filed published companies authors link given by
JP 2016-126295 DSLR Tamron 100-400mm F4.5-6.3 VC 2015.1.8 2016.7.11 Tamron Co., Ltd. Katsuhiro Yoshimura, Hiroko Negishi, Yoshito Iwasawa, Jun Takahashi http://thenewcamera.com/tamron-100-400mm-f4-5-6-3-vc-patent/