تماشای ویدئو دستگاه جلادهنده زمین بولینگ چطور ساخته می شود؟ از آی-ویدئو

In the early days of bowling shellac based conditioners were applied to wooden lanes to protect the surface. Today, robotic machines apply conditioners in different patterns to change the difficulty of the game. Stream Full Episodes of How It's Made: https://www.sciencechannel.com/tv-shows/how-its-made/