How It's Made S25E13 Traffic Signal Poles, Coffee Filters, Chainsaw Mining Machines

How It's Made Season 25 Episode 13 Online – Metal tubes and structural sections are formed, welded, protected against corrosion and prepared to support traffic signals. Porous paper is formed, cut, pleated or crimped into disposable coffee filters, while heavy steel frames, drive systems and chains fitted with cutting teeth are assembled into machines that cut through rock and mineral deposits.