I remember working in a camera store in Wash DC when the Beseler salesman came around with the first negatrans, 1968 - 1969, as I recall. I got a 35mm one for $15. It seems like the 6x7 and maybe 6x9 (?) formats came out around the same time, I'm a bit foggy on this, though, I wasn't shooting 2 1/4 at the time.
Beseler made them for some years, so I would think they made some.
I don't know about ever, but as of the 1999 catalog PDFs that I have stashed away, they listed the 120 negatrans as "8082 NEGATRANS CARRIER FOR 6x6 AND 6x7 FILM," though they also listed a 645 pressure plate to go with it.