Vitro made the Helmets. If it's called a Helmet by most collectors, it's a Vitro. (For some time, it was thought maybe Akro made them, but that has been cleared up. Only Vitro.)
I'm not seeing Helmets here, but they do appear to mostly be Vitro. (I'm not sure about the blue one on the bottom middle.) Bottom right Conqueror. I think top right may be in the Conqueror family also, but with a blue base I'm not 100% where it lands.