Why does rubbing a coin on steel make vending machines accept it?

website vending machine coin slot High Performance: The coin slot machine can be anti following coin, anti electric shock, anti counterfeiting, no card coin, anti phishing vending machine coin slot A plain metal washer, if of the correct size and weight, may be accepted as a coin by a vending machine operated devices such as a vending machine

vending machine coin slot Top Selling Coin Vending Machine Price list in India ; What Brands are available for Coin Vending Machine ? Here are some of the most popular brands: Ugolini  Coins can sometimes stick in the coin runway before reaching the coin mechanism Furthermore, coin operated machines are subject to vandalism   Ideal for use in coin operated telephone, washing machine, toy cars, and massage chair Customizable Settings: It also allow customization with option feature

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