Therefore, it is best not to depend exclusively upon titles to delineate the subject matter encompassed by a class or subclass; reference to respective definitions and notes is essential.
If a search is to be expeditious, accurate, and complete, the Manual of Classification should be used only as a key to the class or subclass definition and appended notes.
[citation needed] Basic Manuals reflect current classifications as of December of even-numbered years.
Pages of the Manual revisions are inserted as replacements to update the previous versions.
This article incorporates public domain material from Manual of Patent Examining Procedure, Chapter 902.