"Marxism has consistently treated science and technology as part of the productive forces. More than a century ago, Marx said that expansion of the use of machinery in production requires the conscious application of natural science. Science too, he said, is among the productive forces.The development of modern science and technology has bound science and production ever more tightly together. It is becoming increasingly clear that science and technology are of tremendous significance as productive forces."
January 1, 1970
https://en.wikiquote.org/wiki/Deng_Xiaoping