Pedro Flores is credited with first mass-producing the yo-yo as a toy in Santa Barbara, California.
Duncan bought the rights in 1929 and trademarked the name, "Yo-Yo".
For more info, see the related link below.
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Philippines
The hair dryer, yoyo's, traffic lights! The band aids. One of the most popular snacks around this time was the peanut butter and jelly sandwish.
the radio was not invented in the 1920s, but it came out in the 1920s when people could buy them
The drill press was invented in the 1920s
YoYo biscuits were originally invented in South Australia by Menz (the makers of FruChocs). Menz were later bought out by Arnotts who are the current producer of these amazing biscuits. It is very difficult to find YoYo biscuits outside of SA!
Around the 1920s.
wind turbine
in the 1920s in the us.
1920s
in the 1920s in the us.
early 1920s
There where many inventions in the 1920s as it was a time of change but 2 big ones are the car and insulin. I also think that crayobs were invented in the 1920s.