Browning Machine Gun, Model 1917, s.n. 1. Manufactured by Westinghouse, cal.: .30”, 450-600 rpm
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German Machine Gun, Model MG-42, s.n. 1136. Manufactured by Alkett, cal.: 7.92mm, 1,350 rpm
Springfield Armory NHS, US NPS
<a rel="nofollow" class="external text" href="https://www.nps.gov/spar/learn/historyculture/images/IMG_2691.JPG">Springfield Armory National Historic Site (U.S. National Park Service Official Web-site)</a> (<a rel="nofollow" class="external text" href="https://www.nps.gov/spar/learn/historyculture/machine-guns.htm">link</a>)