The American inventor Thomas Alva Edison was born on ... .
In 1877 Edison invented the transmitter that is still used in telephone speakers and microphones.
What did the scientist invent in 1879?
In all, Edison patented more than ... discoveries.
Створюйте онлайн-тести
для контролю знань і залучення учнів
до активної роботи у класі та вдома