Sam, the Models 980 and 990 were first imported to the US in 1966 by New Holland, about the time Sperry Corp, a large, multi-faceted conglomerate bought NH. If you can, find out just when the Sperry acquistion took place, too. Some of those first NH's were all-yellow. I saw an odd, solid yellow 980, in 1976, during a family vacation trip through west Oklahoma, during wheat harvest season. Most 980 and 990 here were the familiar NH red with bright yellow points which made them rather gaudy as combines go.
As far as New Holland "never building combines," look at the later conventionals. Sperry left NH in the mid-1970s, and New Holland was a stand-alone and growing corporation, with very strong interest in Europe, eventually taking over the Claeys [Clayson] name. Yes, the Euro bines were born under the full New Holland name.
The Twin Rotors were the first all-American-made New Holland combines. Originally built in Lexington, Nebraska, not Grand Island or even New Holland, PA, as some may think. Only one started, the TR 70, and it was more of a "prototype" in most people's eyes just due to its own oddityand uniqueness--the world's first first commercially-successful "rotary" combine. I can still remember some farmers and mechanics asking if that thing really had a Wankel engine. LOL! THAT was the definition of "rotary" back in the early 1970's.