Xerography or electrophotography is a dry photocopying technique. Its fundamental principle was invented by Hungarian physicist PÃ¡l SelÃ©nyi and based on SelÃ©nyi's publications Chester Carlson applied for and was awarded U.S. Patent 2,297,691 on October 6, 1942. The technique was originally called electrophotography.
A retrospective, generally, is a look back at events that took place, or works that were produced, in the past. As a noun, retrospective has specific meanings in medicine, software development, popular culture and the arts. It is applied as an adjective, synonymous with the term retroactive, to laws, standards, and awards.
Retrolisthesis Vertebral Misalignment. Retrolisthesis is the exact opposite of an anterolisthesis condition and is sometimes known by the diagnostic term retrospondylolisthesis.This spinal abnormality describes a condition in which one or more vertebral bones move out of alignment with the bones above, and/or below, towards the rear of the body.etrolisthesis Vertebral Misalignment. Retrolisthesis is the exact opposite of an anterolisthesis condition and is sometimes known by the diagnostic term retrospondylolisthesis.