However, noticing that DeForest's system

However, noticing that DeForest's system had little to no quality sound worth reproducing, Case developed the AEO Light, which proved practical for exposing amplified sound to film. With the AEO Light, DeForest was finally able to produce films with audible sound. Following that, Case Research Lab decided to build their own camera, because DeForest continued pursuing unworkable solutions toward perfecting sound film. With their new camera, Case and Sponable filmed President Calvin Coolidge on 11 August 1924, allowing DeForest to have the film developed in New York City. When DeForest showed the film — as well as an earlier presentation of 18 short sound films at the Rivoli Theater in New York City on 15 April 1923 — DeForest claimed full credit for Case's invention that made it possible.
Shortly after, Case tired of DeForest's continuing false claims about Case Research Lab inventions and ended his relationship with DeForest, and dedicated his lab to perfecting the system they had provided DeForest, whose own attempts at recording sound were all failures. Documents supporting this, including a signed letter by De Forest that states that Phonofilms are only possible because of the inventions of Case Research Lab, are located at the Case Research Lab Museum in Auburn, New York.[1]


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