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Walter Schlage had already secured several patents dating back to 1909, when he patented a doorknob that would also complete an electrical circuit so that, for instance, the lights would turn on when the door was opened. [4] However, Schlage's key invention was the bored cylindrical lock, which evolved through several iterations, including a ...
His first patent was in 1909, inventing a door lock that turned lights on and off. [1] At the time, Schlage was a citizen of Germany residing in Berkeley, California. [2] In 1919, Schlage patented a door knob which, when pushed up, locked the door. [3] [4] This was succeeded by a door knob incorporating a push-button lock, patented in 1924. [5]
This is an accepted version of this page This is the latest accepted revision, reviewed on 5 February 2025. Device to open or close door Various examples of door handles throughout history A door handle or doorknob is a handle used to open or close a door. Door handles can be found on all types of doors including: exterior doors of residential and commercial buildings, internal doors, cupboard ...
The Quest for Camelot Audio Action-Adventure was a follow along audiobook based on the film. Released April 7, 1998, [ 48 ] the interactive story features two new songs that were not included in the movie, Camelot and To Be a Knight . [ 49 ]
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