The Type 97 heavy tank machine gun (九七式車載重機関銃, Kyū-nana-shiki shasai jū-kikanjū) was the standard machine gun used in tanks and armored vehicles of the...

the Army. Retrieved 3 July 2021. GB 336690A , Czech patent No. 36583 "九七式車載重機関銃弾薬仮制式制定の件, "Authorizing the designation of the Model 97 in-vehicle heavy...