John,

I am U2U this because I am only going from memory and I may be totally wrong. I remember my cousin selling the OC 4 as late as 1963. These were the 68 inch without blade but equipped with pto for hillside brush cutting. He sold the OC4's with a trailer type 5 ft. Sidewinder rotary cutter with the tire that acted as the gear box. Needless to say he sold several pto parts.
I seems to me that a group from Case talked of continuing the Cletrac line which included the OC4, OC5, and OC12. As you know Oliver was already experimenting with the OC5 &amp; 12. They weren't going under the Case umbrella but was forming a new group with some of the Cletrac engineers. I don't think the Oliver and Cletrac ever agreed on anything.
I may be totally off but it seems that the last Oliver field man that was over the middle TN area talked to my Dad, uncle and cousin about White-Oliver deciding to discontinue the crawler production. I don't remember the field mans first name but his last name was Brown and this would have been 1964.