History
The cylindrical lock was invented by Walter Schlage in 1909. The bored cylindrical lock arose from a need for a more cost-effective method of locking doors. The previous norm, the mortise lock, is a more complex device, and its higher manufacturing cost as well as its more labor intensive installation make the bored cylindrical lock an ideal substitute, both in price and functionality.
Read more about this topic: Bored Cylindrical Lock
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