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Radio Record, 31 July 1936, Page 43

Russa is to install 70,000 new receivers this year. At Cracow the interval signal is by guitar; the guitar has a microphone mounted over the belly: and serewed slantwise across the strings a rod fitted with claws, like the roller in a musical box. You just twist the rod by a handle, and the claws pluck the strings, one after another, at intervals which by this device are rendered constant. OME American radio firms try to sell a car-radio to each new car-owner; others have begun a policy of waiting till all the instalments on the car are paid off before suggesting any extras. Another radio-salesman appoints every car-dealer in his district his agent, and pays a dollar commission on every car radio sold.