. "M197 20mm rotary cannon" . . "M197 20mm Electric cannon" . "M197 electric cannon" . . "XM197" . . "M197 cannon" . . "M197 Gatling gun" . "20 mm cannon" . "1.828" . . . . . . "M197" . "M197 electric cannon" . . "M197 gatling cannon" . "M-197" . . "20 mm calibre canon" . "M197 three-barrel 20x102mm rotary cannon" . . . . . "M197 20 mm automatic cannon" . .