Abstract: A catalytic converter in which exhaust gases to be treated are introduced into a housing containing a catalytic material. Air is introduced into the lower portion of the housing to fluidize the catalytic material and promote the reaction between the material and the exhaust gases to remove poisonous elements such as carbon monoxide, hydrocarbons and nitrogen oxides from the gases.

Abstract: A magnetic tape reproducing and/or recording system in which two magnetic cassette tape transports are mounted on the same chassis and are adapted to selectively drive magnetic tape from two separate type cassettes past separate head assemblies to reproduce and/or record magnetic signals on the tape. The arrangement is such that the second tape cassette is automatically actuated upon the tape in the first cassette reaching its end, and vice versa. Logic circuitry is provided which controls the tape transports so that, after completion of the first cassette tape it can be rewound to a starting position during play of the second tape, and vice versa. A single set of recording and playback electronics can be provided which are automatically switchable between the respective head assemblies depending on the particular operational mode.