Abstract: The present invention relates to a process for producing an aromatic nitro compound by introducing a nitrogen oxide gas and ozone-containing oxygen or air into a halogenated organic solvent dissolving or suspending therein an aromatic compound, thereby subjecting the aromatic compound to nitration. By the use of a system comprising the nitrogen oxide and ozone-containing oxygen or air as the nitrating agent, the aromatic nitro compound can be produced under mild conditions without using any mineral acid. In addition, the various disadvantages due to the use of mineral acid in the conventional process can be avoided by the process of the present invention.

Abstract: A filter cigarette is provided which has a cigarette section formed by wrapping shredded tobacco in a cigarette paper sheet and a filter section having a filter chip integrally joined to the cigarette section. The filter chip is formed by combining in a bundle at least one absorptive synthetic fiber selected from the group consisting of (1) graft polymer fibers produced from irradiated polypropylene reacted with vapor phase styrene and containing adsorptive functional groups, (2) activated carbon fibers, (3) charged electret fibers, and (4) magnetic plastic fibers and then chopping the combined fiber bundle to a predetermined length. Since the filter section does not contain adsorptive grains or particles (i.e., activated charcoal grains or particles), the integrated cigarette manufacturing plant for such filter cigarettes does not required a process or equipment for preventing the scattering of the adsorptive grains or the collection of such grains when they do escape.

Abstract: In a loudspeaker, a suitably formed edge part is provided around the periphery of the diaphragm to form a certain gap between the edge part and an edge receiving part which has an annular recess corresponding to the configuration of the edge part, so that the pressure gradient in the gap is in balance with the surrounding pressure gradient, with the result that the air going in and out of the gap can be substantially neglected.

Abstract: Magnetized active carbon composition consisting of active carbon and a magnetized ferromagnetic material mixed therewith has enhanced properties of active carbon, and may be used in order to remove carbon monoxide, hydrogen and nicotine from tobacco smoke and to control reactions in soil. The above properties are enhanced by applying a magnetic field and/or an electrostatic field to the magnetized active carbon.

Abstract: A ring-type smoker's set for removing carbon monoxide and nicotine from tobacco smoke comprising a member capable of applying a magnetic field and a member capable of applying an electrostatic field.

Abstract: In a loudspeaker, the diaphragm is connected to the edge member fixedly secured to the frame through an intermediate supporting means, at least one part of the intermediate supporting means is made of a material having a low hysteresis characteristic. According to another aspect of the invention, the construction of a loudspeaker is such that the diaphragm supporting means is separated from the airtight means of the diaphragm, so that the loudspeaker can operate in response to even a small signal with high fidelity.

Abstract: In active element of an audio amplifier, there exists a neutral point in which the amplification is minimum. When the middle point of AC mode in a circuit is coincident with the neutral point, noise elements accompanying with input signals are not amplified, i.e. the signal-to-noise ratio of an audio amplifier is improved. The middle point of AC mode in a circuit can be varied by adjusting resistors or capacitors of the circuit.

Abstract: A phono cartridge having a straight cantilever is supported on or upper the corner edge thereof by a suspension wire means limiting the motion in a direction along the cantilever axis and a leaf spring means limiting the motion around the cantilever axis arranged in a manner that the action line is substantially coincident with the gravity center thereof and the mass around the action line is in balance.

Abstract: A counterweight supported on the tone arm of the record player in which a weight member making an inertial motion is movably incorporated so as to apply a damping resistance to the tone arm.

Abstract: A moving coil cartridge comprises a cartridge casing with a magnet and a moving coil for converting vibration of a stylus to electrical energy and a stylus holder case having a magnetic member which is attracted by the magnet to fix the stylus holder case to the cartridge casing.

Abstract: A process for curing a resin composition for the manufacture of plastic thin films by radiation curing with radioactive rays comprising mixing a radical-polymerizable resin with a filler, characterized in that at least a part of the filler is composed of a powdery ferromagnetic substance and in that said powdery ferromagnetic substance is incorporated in an amount of 1.5 to 998 parts by weight based on 100 parts by weight of the radical-polymerizable resin.

Abstract: In a moving-coil type loudspeaker, a tubular member of a length longer than the wave-length of any one of the frequencies in a desired frequency range and having a constant cross-sectional area along its length, is coupled, at one end thereof, with one side of a vibrating plate or diaphragm through an acoustic transformer constituted by a cavity formed therebetween, whereby the loudspeaker is capable of reproducing sounds with high fidelity particularly in extremely low frequency ranges.