local tech_table = {
    MicroManufacturing = "AutoMaticElectronicsFactory",
    NuclearFusion = "AutomatedFusionReactor",
    DronePrinting = "AutoMaticDroneAssembler",
    NuclearFusion = "FusionSpire",
    LowGHydrosynthsis = "AutoMaticPolymerFactory",
    ["3DMachining"] = "AutoMaticMachinePartsFactory",
    LowGFungi = "AutoMaticFungalFarm",
}

local function ToggleLock()
    -- local them for slightly more speed
    local UICity = UICity
    local UnlockBuilding = UnlockBuilding
    local LockBuilding = LockBuilding
    for tech,bld in pairs(tech_table) do
        if UICity:IsTechResearched(tech) then
            UnlockBuilding(bld)
        else
            LockBuilding(bld)
        end
    end
end
OnMsg.CityStart = ToggleLock
OnMsg.LoadGame = ToggleLock
OnMsg.TechResearched = ToggleLock