1920
- The Band-Aid
- Tommy Gun
- Lie detector
- Insulin
- The first 3D Movie is released
- Frozen food
- Self-winding watch
- The traffic signal
- Spiral Notebooks
- Loudspeaker
- The mechanical television (pre-television, television)
- Liquid-fueled rocket
- Crystal quartz watch
- PEZ
- Technicolor
- Electronic television
- Iron Lung
- Discovery of penicillin
- Electric shaver
- Bubble gum
- Car radio
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