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Perhaps a bar graph indicating record or album sales?
According to the Heintzman piano serial number chart graph, this serial number could have been made sometime between 1921 and 1922. Serial numbers for legacy pianos tend to increase by varied amounts. So this piano is not quite a hundred years old.
Morris code, tele-graph, light signals on ships.
what is the difference between reverse characteristics of zener diode and a practical diode ?