An early induction cooker patent from 1909, which illustrates the principle.
From Rankin Kennedy, Electrical Installations, Vol II, 1909.
Induction cooker in an interesting type of stove that has its own benefits and limitations. Different types and designs of this kind of stove exist since the beginning of the 20th century but we had to wait until 21st for it to become widely available com common households.
Microwave oven is common kitchen appliance today but it was discovered by accident and at the beginning was so big and expensive that only hotels and rich could afford it. Read more about microwave oven history.