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2. File:University of North Dakota logo - interlocking ND.svg

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

   This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain. Although it is free of copyright restrictions, this image may still be subject to other restrictions.

3. File:Logo du Modular Lock (M-LOK).svg - Wikipedia

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

   This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain. Although it is free of copyright restrictions, this image may still be subject to other restrictions.

4. Union Switch & Signal - Wikipedia

   en.wikipedia.org/wiki/Union_Switch_&_Signal

   US&S built the first power interlocking system in the United States, a pneumatic design, in 1882 at East St. Louis, Illinois. Within several years the company developed an electro-pneumatic system, which was widely adopted by railroads across the country.

5. File:Block and interlocking signals (IA ...

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

   Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

6. File:Florida State University interlocking FS logo.svg

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

   This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain. Although it is free of copyright restrictions, this image may still be subject to other restrictions.

7. File:USC Trojans logo.svg - Wikipedia

   en.wikipedia.org/wiki/File:Interlocking_USC_Logo.svg

   This logo image consists only of simple geometric shapes or text. It does not meet the threshold of originality needed for copyright protection, and is therefore in the public domain . Although it is free of copyright restrictions, this image may still be subject to other restrictions .

8. Interlocking - Wikipedia

   en.wikipedia.org/wiki/Interlocking

   An interlocking system is designed so that it is impossible to display a signal to proceed unless the route to be used is proven safe. Interlocking is a safety measure designed to prevent signals and points/switches from being changed in an improper sequence. For example, interlocking would prevent a signal from being changed to indicate a ...

9. File:Editable Logo.pdf - Wikipedia

   en.wikipedia.org/wiki/File:Editable_Logo.pdf

   You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made.