Question: REV Group (formerly Allied Specialty Vehicles) is an American manufacturer of specialty vehicles the in Fire & Emergency, Recreational Vehicles, and Bus & Industrial sectors, it was formed in which year, by American Industrial Partners' merging of four companies, one being Collins Industries, a Hutchinson, Kansas company that specializes in manufacturing of Type A and Type B school buses, and also manufactures ambulances and other special-purpose vehicles?
Sentence (from "Collins Industries"): The company was founded in 1971 and as of 1998 it was made up of four subsidiaries: Collins Bus Corporation, Wheeled Coach Industries, Inc.; World Trans, Inc. and Capacity of Texas, Inc.
Relevant evidence: No