 In electron beam lithography, Goto's work included the development of double deflection tubes and variable shaping techniques.In the early 1970s, Goto's work on electron beam lithography led him to become interested in the ability of symbolic algebra systems to manipulate mathematical formulae.In order to implement these systems, Goto developed a new Lisp system called HLISP, in which he had introduced the innovative technique of hash consing to eliminate redundant memory usage by using a hash table to map duplicated values to the same position in memory.