https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13966200Edit ImageSaveSaveEditCropCustom TextAn early cardiograph used by J.B.A. Chauveau. Photograph.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 907 px | 300 dpiLarge JPEG 3232 x 2444 px | 300 dpiFree DownloadAn early cardiograph used by J.B.A. Chauveau. Photograph.More