What were five inventions created in the 1930?

In the 1930s, several significant inventions emerged, including the first commercially successful television, developed by Philo Farnsworth. The jet engine was also invented during this decade, revolutionizing aviation. Additionally, the ballpoint pen was patented by Laszlo Biro, making writing more convenient. Other notable inventions include the electric refrigerator and instant coffee, which transformed food preservation and beverage consumption, respectively.