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2. Schlage - Wikipedia

   en.wikipedia.org/wiki/Schlage

   Schlage (/ ʃ l eɪ ɡ / SHLAYG) [1] [2] is an American lock manufacturer founded in 1920 by Walter Schlage. Schlage was headquartered in San Francisco from its inception until it relocated to Colorado Springs, Colorado, in 1997. Schlage also produces high-security key and cylinder lines Primus, Everest, and Everest Primus XP.

3. File:Schlage everest C123 key blanks.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Schlage_everest_C123...

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4. Fairchild C-123 Provider - Wikipedia

   en.wikipedia.org/wiki/Fairchild_C-123_Provider

   A Chase XG-20 glider, which was later converted to the XC-123A prototype. The XC-123 prototype. The C-123 Provider was designed originally as an assault glider aircraft for the United States Air Force (USAF) by Chase Aircraft as the XCG-20 (Chase designation MS-8 Avitruc) [2] Two powered variants of the XCG-20 were developed during the early 1950s, as the XC-123 and XC-123A.

5. Walter Schlage - Wikipedia

   en.wikipedia.org/wiki/Walter_Schlage

   Walter Reinhold Schlage (1882–1946) was a German-born American engineer and inventor. Known as the Lock Wizard of Thuringia , he is best known for the bored cylindrical lock and the lock company that bears his name, Schlage Lock Co.

6. Keycard lock - Wikipedia

   en.wikipedia.org/wiki/Keycard_lock

   Mechanical keycard locks employ detainers which must be arranged in pre-selected positions by the key before the bolt will move. This was a mechanical type of lock operated by a plastic key card with a pattern of holes. There were 32 positions for possible hole locations, giving approximately 4.3 billion different keys.

7. Interchangeable core - Wikipedia

   en.wikipedia.org/wiki/Interchangeable_core

   Interchangeable cores require a notch at the tip of each key to properly align the peaks and valleys of each blade with the combinating pins in the chambers of the mechanism; as a consequence, these keys are always configured and cut from blade tip to bow. Conversely, conventional cylinders and removable cores use a shoulder near the bow of ...