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.
Thursday 8 November 2001 13.11 EST First published on Thursday 8 November 2001 13.11 EST. The Shakespeare First Folio: The History of the Book Vol. I: An Account of the First Folio Based on Its Sales and Prices, 1623-2000 by Anthony James West Oxford, 215 pp., Â£70, 5 April, 0 19 818769 6.