Abstract: Aircraft brakes are refurbished by a rapid chemical vapor deposition method utilizing a liquid carbon-precursor as a carbon source for carbon densification. Inductive and resistive heating means are utilized to carry out the method.

Abstract: A folding tool bar for agricultural implements and including a central section and outboard wing sections hingedly connected thereto for movement between extended operative lowered positions where they may follow rolling ground conditions and folded over-center raised positions to reduce transport width. Each wing section is actuated by a two-stage hydraulic cylinder on the central section which cooperates with a crank arm on such wing section during its first stage to apply torque to the crank arm through the medium of a draw link by a pulling action in tension, assisted by a powerful camming action, the two forces serving to raise the wing so that it barely clears the ground at a small angle on the order of 5.degree., thereby enabling the implement to perform a turnabout motion with the tools withdrawn from the ground but with the wing remaining unfolded. An abutment within the cylinder positively terminates the first stage of operation and determines the 5.degree.