Who invented the gun where  The Blish Lock was first used?
Blish lock The Blish Lock is a breech locking mechanism designed by John Bell Blish based upon his observation that under extreme pressures, certain dissimilar metals will resist movement with a force greater than normal friction laws would predict. In modern engineering terminology, it is an extreme manifestation of what is now called static friction, or "stiction". His locking mechanism was used first in the Thompson submachine gun.
Cei-Rigotti The Cei-Rigotti (also known as the Cei gas rifle) is an early automatic rifle created in the final years of the 19th century by Amerigo Cei-Rigotti, an officer in the Royal Italian Army.