Pocket calculators first appeared in the 1970’s.
Category: Inventions
The first refrigeration device was made in 1748. The first air conditioner was made in 1902.
Edwin Beard Budding invented the lawn mower in 1830.
The compact disc was invented in 1965.
Bulletproof vests, fire escapes, windshield wipers, and laser printers were all all invented by women.