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Several articles from June of 1938 mention these sets. They also mention that DuMont had started selling sets. It is unclear if the DuMont sets are the Cossor models, or if they are the DuMont-made sets. The description of the sets doesn't match the design of the models 180 and 181, since both models had both video and sound.
A November, 1938 article in Broadcasting says that DuMont is selling video receivers. These are most likely the DuMont-made models 180 and 181.
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