Well, the Iranian technology is an interesting mix of primarily US and Soviet-Russian equipment. Along with some domestic copies.
At the time of the Iranian Revolution, they were probably tied neck and neck with Israel in that area. Both militaries professionally trained, and equipped with some of the best equipment that the US would export. Some of which they have actually never exported to anybody else. Like the F-14, the only two nations to ever use that state of the art fighter was the US and Iran.
Or another one many are not aware of, the "Kidd Class Destroyers".
Often jokingly called the "Dead Admiral Class", because of the names they were given.
Built in the late 1970s as a localized copy of the Spruance class Destroyers, those were at the time the most advanced ships of the type in the world. And only used by the US. But when Iran requested some for themselves, the US built four of them.
Not much different than a Spruance, but having more emphasis on climate control ("super sized AC") and dust filtration being the largest differences. But the Revolution came shortly before the first was to have been delivered, so the US simply kept them. Naming them the Kidd class, and each ship named after an Admiral that had died in combat.
And serving in the Navy from 1981-1999, when the four ships were sold to Taiwan.
But Iran has since then done some rather interesting things with the technology they inherited from the Shah. Like the previously mentioned HAWK missile. Now that was a 1950s era missile, three bare missiles sitting on a launcher.
Now one of the most interesting adaptations was when during the Iran-Iraq war they started running low on US made air-to-air missiles, and the Soviet missiles would not work on their F-14. So their solution was to modify the HAWK missile to work from the F-14.
And in the decades since, they have continued to refine the system. Improving the RADAR, and most recently with the Mersad-16 variant placing the missiles into shipping-launching containers that are then placed on the launcher.
And from a technological and functional standpoint, that is actually a considerable upgrade. But in the end, it is still just a modification of the original HAWK system. Firing a domestically made version of the original HAWK from 1960.
Not the kind of evolutionary journey of say the PATRIOT. Which other than the launcher vehicle itself bears almost nothing in common between those fielded in the early 1980s and today. Multiple generations of missiles, as well as a major upgrade in the launcher itself. For the Mersad-16 to have made a similar change, each of these "New Launchers" would actually be sporting not 3 but 12 missiles each. And being designed to kill their targets via kinetic kill, not proximity fused detonations.
Over the decades, they have gone from being tied for first to one of the weaker militaries in the region in regard to quality and capability of equipment. Still a match for the nations they border, but as was seen nowhere close to the US and Israel.
I am sure they can still pump out more Mersad-16 missiles and launchers. But their effectiveness was so poor, I am not sure why they would even want to. Even with the upgrades they did, it is still a system over six decades old. And simply not up to the challenge of taking out much more modern aircraft.
Ironically, maybe a good use for them would be to sell them to Ukraine. A lot of the aircraft being used against them are exactly the kinds of aircraft that was designed to counter in the first place.