Abstract: A card and associated system and method provides disposable but secure telephone debit cards. Identifying indicia are disposed on the telephone debit card surface, and temporarily covered so that it cannot be visually or photographically detected. After purchase of a debit card from a distribution terminal or device, a user is able to remove the temporary covering and access a telephone service system by first accessing a central system server and communicating to such central system server the now revealed identifying indicia on the purchase card. The central system server monitors the duration of a user's telephone usage, and charges an appropriate associated toll against the debit card's predetermined debit limit. Separate toll rates may be applied for different forms of calls, eg., interstate long distance, intrastate long distance, local, or even collect or conference calling, or modem service.

Abstract: An adjustable wrench having a fixed jaw and a spring biased movable jaw. A coil spring acts on an end of a worm gear opposite the fixed jaw, which, in turn, acts on a rack of teeth provided on a portion of the movable jaw to force the movable jaw towards the fixed jaw. The worm gear is rotated to advance the movable jaw against an object which is to be gripped. Upon contact of both the movable jaw and the fixed jaw with the object, the worm gear is rotated further to compress the coil spring. The force of the coil spring against the worm gear diminishes looseness between the worm gear and the movable jaw, and compression of the coil spring further diminishes any such looseness and enhances holding power of the wrench about the object.