I want to know the answer to the following question:
At which time were the 79 rpm no longer mass produced?
All the background I'm provided with is that "The older 78 format continued to be mass-produced alongside the newer formats using new materials until about 1960 in the U.S., and in a few countries, such as India (where some Beatles recordings were issued on 78), into the 1960s.". Is that enough to answer the question?
Answer: yes