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US4198880A
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Rotor drive for pulsato apparatus
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Planetary acoustic phase shift mechanism
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Harmonically related pulsato system
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Speaker system for pulsato and celeste effects
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Electronic organ utilizing proportional frequency changes for harmonic structure
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Electronic organ system utilizing band elimination filters for minimizing beat effects
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Rotor drive for pulsato apparatus
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Model train control system
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Multiple sound channel tremolo device
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Pitch broadening apparatus for musical instruments having electronic tone generators
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Rotary tremolo device having means for mixing signals emanating from rotary and non-rotary sources
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Speaker system for adding tremolo
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Electrical circuit arrangement for complex wave generators
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Apparatus for minimizing beat effects
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System for recording and reproducing electric organ music
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Mercury slip ring assembly
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Vibrato-oscillator for electronic organs or the like
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Derivative voltage regulation circuit
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USRE24566E
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Acoustic apparatus
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Cross-wired organ system and rectifier therefor
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