First, the extinguisher valve is removed and the threads and interior of the cylinder are checked for corrosion, pitting, and any other abnormalities. [29 CFR 1910.157(f)(3)] If the cylinder passes the visual inspection, it is placed into a steel chamber, which is then filled with water at normal pressure.
Updated April 17, 2017. The earliest dated printed book known is the Diamond Sutra, printed in China in 868 CE. However, it is suspected that book printing may have occurred long before this date. In 1041, movable clay type was first invented in China.
Dr.Seuss published his first book in the early 1900's many considered him crazy or stupid for writing books like he did but in the end they saw how it really taught kids how t â¦ o read. December 21st, 1937; And to Think That I Saw It on Mulberry Street. Fluffkat. 18,981 Contributions.