Abstract: A drill string working tool is provided that may be releasably engaged to and removed from a drill string member. The tool, such as a cylindrical stabilizer body, is positioned around a cylindrical drill string member, the inner diameter of the stabilizer body being greater than the outer diameter of the drill string member, so as to provide an annular cavity between the stabilizer body and the drill string member. A heating element disposed within a protective outer sheath is mounted axially along the inner surface of the stabilizer body. For installation, a low melting point solid material such as zinc or a zinc alloy is poured in to substantially fill the annular cavity. The stabilizer compression preloads the zinc onto the drill string member, and thus the stabilizer body is non-rotatably attached to the drill string member. For removal, the low melting point fill material is removed from the annular cavity by remelting with the interior heating element and pouring out the fill material.

Abstract: An arrangement for bidirectionally driving a hammer bank shuttle assembly along a linear path in a line printer includes an opposite pair of circular, rotatable elements having an elongated shuttle assembly mounting element and an elongated counterbalancing element extending between the pair of rotatable elements on the opposite sides thereof. Pole pieces and a magnet disposed between and adjacent the shuttle assembly mounting element and the counterbalancing element provide magnetic flux which flows through portions of the opposite elements to attract and maintain the elements in contact with the opposite rotatable elements.

Abstract: A high resolution letter quality 24 by 40 dot matrix ink jet printer includes a movable print head having print elements disposed to print along a slanted line, a character generating module providing character dot patterns to be printed and a modular skewing circuit arranged to receive the dot pattern information and provide the information to the print head in a rearranged order that corresponds to the order in which dot patterns are printed by the print elements. Because the skewing circuit divides each character dot pattern into eight dot pattern modules and operates on the dot pattern modules one at a time in sequence, the finer resolution of a slant head printer can be obtained without need for a huge triangular shift register operating on all of the dot rows of a dot column in parallel to skew the dot pattern information into conformity with the corresponding relative print element locations.