https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13995684Edit ImageSaveSaveEditCropCustom TextFlying machines with propellers in the air. Wood engraving.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 995 px | 300 dpiLarge JPEG 2932 x 2432 px | 300 dpiFree DownloadFlying machines with propellers in the air. Wood engraving.More