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    The first computer “bug” was found in the Harvard Mark I by Grace Murray Hopper when a moth caused one of the relays to fail.

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The first electric dental drill was patented

On the 26th January, 1875, Dr. George F. Green received a patent for the first electric dental drill.

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  • On 20th August, 1889, Australian Arthur James Arnot patented the first electric drill... Read more »
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