C&C
They are still around, with their US soft drink headquarters in New Jersey. The company is based in Ireland, and has been in business since 1852.
I had forgotten about their C&C Television division. In 1955 they purchased the RKO Radio Pictures film library from General Tire & Rubber, which had just acquired RKO from Howard Hughes. TV stations who bought 16MM film packages from them got a life-of-print lease for those titles. The RKO introduction (with the radio tower) was removed, and a "C&C Movie time" title inserted. The end frames with the RKO triangle were also replaced with C&C. Commercials for C&C soda were shown during the original airings. Since the stations got rights to show these films until they were worn out, some prints still exist, and may still be being shown. Some VHS tapes and DVDs of RKO titles are sourced from these. The C&C versions also sometimes ended up as 16MM rental prints for schools, etc. Our HS saw a Marx Brothers movie in the early 70's that was such a print. The contrast in these prints is intentionally low, due to the TV technology of the time they were transferred. Warner now owns the rights to RKO titles, and has made their DVDs and Blu-rays from better sources, such as 35MM fine grain masters.