The Hammond Organ
The Hammond organ was introduced in US Patent 1,956,350. A difference between the Hammond organ and Telharmonium is that Telharmonium tones were something like ``bandlimited square wave'' tones (see Fig.G.1), while the Hammond organ tone wheels were carefully machined to provide nearly sinusoidal components. Thus, the Hammond organ truly classifies as an ``additive synthesis device'' (§G.8). It has survived essentially intact to the present day, and has been extensively simulated electronically (e.g., in Korg synthesizers).
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Dudley's Channel Vocoder
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Early Additive Synthesis in Film Making