1. Any device which allocates a telegraph line to each of a number of channels, or to each row of holes on a punched tape, in succession.

2. A rotary switch that directs the high-voltage ignition current in the proper firing sequence to the various cylinders of an internal combustion engine.

The electronic circuitry which acts as an intermediate link between the accumulator and drum storage.

A device for delivering an exact amount of fuel at the exact time at which it is required.