The one million run of US Army M1 steel helmets (known to most people as steel pots) on or about 1967 for the Vietnam War were made from re-cycled US automobiles (scrapped cars).
Modern US army helmets are made from Kevlar.
Helmets are mostly made from polystyrene
Blacksmiths made the swords javelins armour and helmets. Siege towers and other siege equipment were made by the soldiers. The ballistas (crossbow-like catapults) were made by specialised craftsmen enlisted in the army.
Old Army helmets are a little tough to come by. Most of these types of helmets can be found in second hand or antique stores. You may also be able to purchase them on websites like eBay.
The company is Italian but the helmets are made all over the world.
No there is not any helmets made out of reyceld gargabe!
Roman helmets were made of bronze or iron.
The armour, weapons, tools, and everything else used by the Spartan army was made by a slave class called helots.
There are no helmets made specifically for Mining, but normal Helmets do exist in Minecraft.
The demand for helmets made from declined with the advent of the industrial era
world war 1 helmets were made fom sheep skin and cows
Most WW2 era helmets are made by a drop hammer forge. A plate of steel is laid over a form and a heavy hammer pounds it into the shape of the template. The M1 helmet has a thin metal seam formed around the edge so that it will not be sharp. The fitting for the chin strap is welded on. Most helmets of other countries are made in similar fashion. Of course the German helmet is thicker steel as it does not have a liner. The French Adrian helmet is made of 3 pieces that are formed and welded together.