Puerh History - Pu-erh.Net

„In 1940, the Chinese State owned company CNNP started to manufacture Pu Erh Tea with a trademark "Zhong-Cha" at the Fo-Hai Tea Factory (now called "Meng-Hai Tea Factory"). Later, Yun-Nan Tea Company and Guang-Dong Tea Company also produced the same brand and started to export abroad. There were varieties such as red-label, green-label, yellow-label, small-letter and big-letter etc.“

„Depending on the desired product and speed, from quickest and tightest to slowest and loosest, pressing can be done by a lever press, which was operated by hand for tight pressings and has largely been replaced by the modern hydraulic press.“