Daniel Chapman Stillson Daniel Chapman Stillson Daniel Chapman Stillson (March 25, 1826 - August 23, 1899) was an American inventor. He invented the modern adjustable pipe wrench. He was born March 25, 1826 in Durham, New Hampshire. He was the son of William Stillson and Nancy Chapman. He married Ellen Raynes Davis on April 18, 1855. He was a machinist during the American Civil War and served on David Glasgow Farraguts first voyage as a vice admiral. At the end of the Civil War, Stillson returned to Charlestown, Massachusetts, and eventually he moved to Somerville, Massachusetts. He then worked as a machinist at
Firearm (tool) trigger must be pulled only after full compression or the tool will not work (no "bump-firing" allowed). The tool must pass drop tests in all directions to prove that it will not fire even if dropped on the muzzle or knocked against a hard surface. With the coming into effect of the EC Machinery Directive (2006/42/EC), powder actuated tools are distinguished from weapons and are now considered "impact machinery", provided they are "designed for industrial or technical purposes only". After the testing and approval defined by the Machinery Directive for tools of this type, PAT must carry the CE mark