Carl Gustaf, breech-loading, 84 mm recoilless rifle. Original public domain image from Flickr https://www.rawpixel.com/image/8733748/photo-image-public-domain-gunFree Image from public domain licenseIllustration of a knight in Gothic armor from Concilium zu Constanz woodcut (digitized page 34 of 509) https://www.rawpixel.com/image/7666606/image-art-vintage-public-domainFree Image from public domain licenseCanon gun isolated graphic psd https://www.rawpixel.com/image/9650135/canon-gun-isolated-graphic-psdView licenseCow's Head from a frontal representation of a cow emerging from a wall https://www.rawpixel.com/image/12491885/cows-head-from-frontal-representation-cow-emerging-from-wallFree Image from public domain licenseCanon gun, isolated object on white https://www.rawpixel.com/image/9620670/canon-gun-isolated-object-whiteView licenseServet van linnen met dessinnummer 509: roos (1925) by Chris Lebeau and E J F van Dissel and Zonen https://www.rawpixel.com/image/13748784/photo-image-background-art-patternFree Image from public domain licenseAlgememeine Theaterzeitung und originialblat für Kunst, Musik, Mode und Geselliges Leben, ca. 1839, No. 509 : Modebilder zur… https://www.rawpixel.com/image/13774537/image-paper-cartoon-faceFree Image from public domain licenseFour A-10 Thunderbolt IIs with the 442nd Fighter Wing fly in formation during the Wings Over Whiteman airshow on June 15… https://www.rawpixel.com/image/8727757/photo-image-airplane-public-domain-birdFree Image from public domain license