DescriptionSIG-3301.jpg German heavy infantry gun SiG33, Belgrade Military Museum, Serbia. Source Own work Author This file is lacking author information
under the following license: English Wikimedia username: SIG SG 510 URL: https://commons.wikimedia.org/wiki/user:SIG_SG_510 author name string: SIG SG 510
under the following license: English Wikimedia username: SIG SG 510 author name string: SIG SG 510 URL: https://commons.wikimedia.org/wiki/user:SIG_SG_510