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RCA 816k Console Radio, circa l938  c.l999 catskillki  
oAnother mechanical Marvel... by rotating manually the individual discs, favorite stations were programmed on the mechanical tuner.  As the motor rotated the tuning shaft, the notches would engage a switch beneath, stopping the tuner at the right spot on the dial.

I think Edsel Murphy, Rube Goldberg, and Spike Jones worked for RCA on this one...