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the six skills and other discussions creative solutions - the six skills and other discussions creative solutions for technical divers mr steve lewis on amazon com free shipping on qualifying offers this book is not exactly a textbook or a manual giving divers d i y advice on the specifics of technical diving, glossary of underwater diving terminology wikipedia - a aa6061 aluminium alloy 6061 not subject to sustained load cracking currently 2012 used for manufacture of new diving cylinders aa6351 aluminium alloy 6351 this alloy is subject to sustained load cracking and requires periodical eddy current testing no longer used for new cylinder manufacture but many cylinders of this alloy are still in service