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The earlier chassis used in the 4586 carried the model number 100.151. The schematic appeared in Vol. 8 of Rider. Interestingly, the chassis which was used in this radio had the model number 100.156 and did not appear in Rider until following WWII. It appears in Vol. 18. Unclear, but this may have been an experimental chassis when developed by Colonial in 1936. Service information including parts and wiring schematic, was glued to the side of the chassis and had to be relied upon for servicing.
 
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