In the years leading up to the One Year War, the Zimmad Company was among the companies trying to win the military contract with the Principality of Zeon, which would be provided to whichever company developed a working prototype of a next-generation mobile weapon. The Zimmad Company, alongside rival Zeonic Company, developed and produced a mobile suit prototype, the EMS-04 Zudah and the MS-04 Prototype Zaku respectively. Though Zimmad's Zudah mobile suit design had a high-performance rating it had a fatal defect in the propulsion system and consequently lost out to the Zaku.
To compete with Zeonic's MS-07B Gouf, Zimmand Company created a limited production of MS-08TX Efreet. The production would be halted in favor of newer and more revolutionary designs like the MS-09 Dom. Zimmad eventually triumphed over its longtime rival Zeonic with the success of their Dom line of mobile suits. The MS-09R Rick Dom was chosen to succeed the Zaku II as the Principality's main space combat mobile suit, and it was probable that the MS-09 Dom would have become the main ground mobile suit if Zeon hadn't been pushed off the Earth. However, its next design, the YMS-15 Gyan, was rejected in favor of Zeonic's MS-14 Gelgoog.
After the end of the war, Zimmad was absorbed by Anaheim Electronics and renamed "AE/ZIM". It would go on to develop several mobile suit weapons, such as the clay bazooka and the GP02A's atomic bazooka. It also continued to maintain and improve the Republic of Zeon's weapons.
- Jean Luc Duvall - An officer in the Principality Forces after working as a test pilot at Zimmad for 12 years.
- Zimmad was first mentioned in Gundam Century and made its first on-screen appearance in the final episode of Mobile Suit Gundam MS IGLOO: The Hidden One Year War.