Abstract: A hydraulic chuck device for use with the inside of a tube. Included is a body defining a chamber and a piston slideably mounted in said chamber. An axially centered stem means is mounted at one of its end on said piston and has a passage along its axis, while sleeve means slideably cover said stem means and are mounted on said body. Collet means are operably connected to said stem means and said sleeve means such that relative movement of one with respect to the other causes activation of said collets. First fluid means are connected to said piston to cause relative movement between said stem and said sleeve, and second fluid means are connected to said stem means for passage of fluid through said passage of said stem means into the inside of said tube.

Abstract: This invention provides 2,4-diamino-5-benzylpyrimidines represented by the formula ##STR1## wherein R.sub.1 is H or loweralkyl; R.sub.2 is H, loweralkyl or R.sub.3 CO-- wherein R.sub.3 is H, alkyl, or cycloalkyl-lowerakyl; and X is a halogen; and the acid addition salts thereof.These pyrimidine compounds are useful as antibacterial agents, and as potentiators of the anti-bacterial activity of sulfonamides.

Abstract: A grouser bar and its manufacturing method, the bar being adapted for attachment to worn tractor pads. The bar is hardened on one of its edges and its ends for wear resistance and is relatively soft for weldability at the opposite edge. The ends are thickened in relation to the balance of the bar and regions of curvature are provided at the ends of the bar for matching the worn shape of the old bar.

Abstract: This invention provides 2,4-diamino-5-benzylpyrimidines represented by the formula ##STR1## wherein R.sub.1 is H or loweralkyl; R.sub.2 is H, loweralkyl or R.sub.3 CO-- wherein R.sub.3 is H, alkyl, or cycloalkyl-loweralkyl; and X is a halogen; and the acid addition salts thereof.These pyrimidine compounds are useful as antibacterial agents, and as potentiators of the antibacterial activity of sulfonamides.