[2] On ground, the HS.820 was used in combination with the HS.661, a single simple anti-aircraft gun mount,[3] and was also mounted on the AMX-13 DCA (Défense Contre Avions), a self-propelled anti-aircraft weapon for the French Army.

[4] In the United Kingdom, BMARC developed A32, a locally operated naval mounting incorporating two HS.831.

[1] And LSE (Laurence, Scott & Electricmotors Ltd; presently MSI Defence Systems) also developed a single mount for KCB, which became DS30B.

[1] The United States Navy designated the twin HS.831 weapons system developed by Emerson Electric as EX-74.

[5] This mount was never used by the USN widely, but commercialized as the Emerlec 30 and purchased by foreign navies.