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. 2015 Sep 28;5:14459. doi: 10.1038/srep14459

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(a) R2R gravure with video-camera-based servomechanism to control the overlay printing registration accuracy of the machine and transverse directions to ±20 μm along with the descriptive lay out for controlling the overlay registration accuracy of R2R gravure up to ±20 μm using a three CCD camera system. (b) Image of R2R gravure-printed SWNT-TFTs with 5 different channel lengths (30 to 230 μm) on 150-m-long PET web.