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.
The Big Book was originally published in 1939 by AA founders Bill W. and Dr. Bob. The book serves as the basic text of AA. There has been a series of reprints and revisions, as well as translations into dozens of languages. The second edition (1955) consisted of 1,150,000 copies. The book is published by Alcoholics Anonymous World Services, Inc. and is available through AA offices and meetings, as well as through booksellers.