Remove the surplus firm word

Warning²Federal courts, Illinois courts21st and 22nd editions

An institutional author's name drops “Inc.” or “Ltd.” where it already carries “Ass'n”, “Bros.”, “Co.” or “Corp.”, which already show the institution is a business firm.¹

1. 1R. 15.1(e) Abbreviations; R. 15.1(d) Abbreviations. Tables: T6 Case Names and Institutional Authors in Citations.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.