Abstract: A drive system for use with a printing apparatus is disclosed. The drive system includes a plurality of process units, with each unit being adapted for effecting a respective repeat operation on a web of material fed along a path defined at least in part by the process units. The drive system further includes an electrically powered rotary motor corresponding to each of the process units or to one or more rotary elements within a process unit. A control system operates to regulate the running speed and angular phasing of each of the motors individually in relation to a predetermined master standard programmed into the control system. The control system is adapted to vary the relative phase angles of the outputs of one or more of the rotary motors by a preselected factor proportionate to the overall running speed of the apparatus in order to maintain accurate registration of each of the process units relative to the web material throughout a substantial range of operating speeds.

Abstract: This invention relates to a vinyl aromatic, especially styrene, polymerization inhibitor system comprising an N-phenyl-1,4-benzoquinoneimine compound and optionally an aryl-substituted phenylenediamine.

Abstract: This invention relates to a vinyl aromatic, especially styrene, polymerization inhibitor system comprising an N-phenyl-1,4-benzoquinoneimine compound and optionally an aryl-substituted phenylenediamine.

Abstract: A polymerization inhibitor composition for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures comprising:(a) a benzofuroxan derivative of the formula ##STR1## wherein R is C.sub.1 -C.sub.4 alkyl or alkoxy; R.sup.1 is a nitro group; and m and n are each independently 0, 1, or 2; and(b) a solvent selected from the group consisting of toluene, xylene, ethylbenzene, vinyltoluene, divinylbenzene, alpha-methylstyrene, and a C.sub.12 -C.sub.18 hydrocarbon,and methods for inhibiting the polymerization of aromatic vinyl monomers at elevated temperatures using this composition.

Abstract: A muffler device for reducing the noise level of an internal combustion engine as exhaust gases and sound waves produced by the operation of the engine are expelled into the atmosphere is disclosed. The device is placed in the exhaust system, being disposed within the exhaust pipe or pipes as close to the exhaust manifold as possible. The device has a sound chamber for attenuating sound waves entering the chamber by deflection of the sound waves back toward their source and a venturi for drawing exhaust gases through the device and expelling them to the atmosphere.