This folder presents my "MRC Discrimination System for Mark-Sense Scanning, a Technical Disclosure", and eventually leading to two (2) U. S. Patents, granted more than three years after the initial filing date of 6 APRIL 1966, in that the first patent was granted 23 DEC 1969, and the second one granted on 11 AUG 1970. These were the first two of my 14 patents granted during my career with MRC, WLC, and NCS from 1956 to 1996. Prior to this invention, the original 1950's circa MRC Scoring machines had certain weaknesses or limitations in the vacuum-tube design of that era to accurately discriminate between a student's intended, darker mark, and an overly smudgy erasure, leading to scoring errors; or failing to detect an intended 'cheat' double/multiple mark, and giving false credit to the student's answer. This invention, incorporating transistorized circuits and an entirely new approach to the solution, essentially eliminated this difficulty, and greatly increased the accuracy (and confidence!) of/in the scored results. Also included in this folder is the lengthy correspondence trail between MRC and our Patent Counsel located in Washington, D.C. Any aspiring inventor who wishes to file for a U. S. Patent on his/her invention should peruse these letters and related documents to realize that the path from idea to a granted U. S. patent can be long and rocky! And, very very expensive today! Lawyers don't work for peanuts! Dr. Lindquist's first U. S. Patent on his original scoring machine also took a long time