What year did the key first appear?
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The year when Television was first transmitted was on 1927. It transmits the first all-electronic television image by Philo Farmsworth.
The original lock and key system was used by Egyptians over 4000 yrs. ago, as discovered by archaeologists. They were crude, and made of wood, but they were the forerunners of the lock and key system we still use today.
1789 was known as First year of liberty.
1914