Z 84 of 2013- '14‎ > ‎Blogs‎ > ‎24 Ali‎ > ‎

Doorknobs

posted Mar 31, 2014, 9:18 PM by Unknown user   [ updated Mar 31, 2014, 9:18 PM by Unknown user ]
Doorknobs are a very useful invention to our society. Without them, all doors would be either push or pull, and that would be very flawed. If someone leaned on a door, and it was push then the door would open without any warning and that could cause injuries. 
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