emery cloth उदाहरण वाक्य

When F . J . of Billerica, Mass . wanted to know how to clean the steel rails of a model electric train set, which had gotten black ( not rusty ) and were not conducting electricity very well, we suggested rubbing the rails with emery cloth.
More Readers to the rescue : When F . J . of Billerica, Mass . wanted to know how to clean the steel rails of a model electric train set, which had gotten black ( not rusty ) and were not conducting electricity very well, we suggested rubbing the rails with emery cloth.