Abstract: An electrostatic attraction apparatus has circuitry for eliminating electrostatic charge. The circuitry has: (i) a short-circuiting mechanism for short circuiting a pair of conductors; and/or (ii) an impressed polarity-inverting mechanism for inverting the polarity of the DC voltage, or the voltage equivalent thereto, which is applied between the pair of conductors, and which is responsive to termination of the DC voltage applied between the pair of conductors from the voltage-generating means. Thereafter, an attracted body can be detached very easily from an attraction layer irrespective of the relaxation time, that is, the length of time required to extinguish the electrostatic charge.

Abstract: A keying system for an electronic musical instrument incorporates time division multiplexing of the individual frequency component signals which are combined to synthesize musical notes or tones. A signal generator provides the fundamental and various harmonic frequency signals which are applied to a plurality of multiplexer circuits corresponding in number to the number of keys on the keyboard of the musical instrument. Activation of a key connects the multiplexer output signals from a corresponding one of the multiplexer circuits to a demultiplexer circuit on a common bus. Time slot signals control the multiplexers and demultiplexer to generate the desired tones corresponding to activated keys.