| http://www.w3.org/ns/prov#value | - When the shell is turned axially in proper direction around the body portion 80, its cams 88 and 89 are moved behind the outer face of each arm 83 in such manner as to press said arm inward, and hence to cause its semisquared extremity S2 to engage the corner of the nut to be turned, and when the shell is again turned in the opposite direction the spring causes the arm 83 to be moved laterally out
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