3. Credit card
Credit cards were first used in the 1920s, in the US, specifically to sell fuel to a growing number of automobile owners. Now a days credit cards are used everywhere from fuel payments to online shopping as they allow small short-term loans to be made quickly to a customer who doesn’t need to calculate a remaining balance before every transaction.
4. Microwave Oven
The first commercial microwave oven was sold in 1947. They are most commonly used for rapid reheating of previously-cooked foods and rapid heating of slowly-prepared cooking items, such as melting chocolates or butter. Any modern kitchen would be incomplete without this amazing and helpful machine.
