Hence, logic minimization was for the most part limited to the use of Karnaugh maps and DeMorgan's law. Because of this, Charles L. Richards invented a method of implementing a finite-state machine that did not need an explicit state-transition table.
The limitation of logic minimization methods (Karnaugh maps and DeMorgan's law) led to the invention of a new method for implementing finite-state machines by Charles L. Richards, which did not require an explicit state-transition table.