Find a famous person
[1855] Find a famous person - Find the first and the last name of a famous person. Text may go in all 8 directions. Length of words in solution: 5,7. - #brainteasers #wordpuzzles - Correct Answers: 63 - The first user who solved this task is Sanja Šabović
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Find a famous person

Find the first and the last name of a famous person. Text may go in all 8 directions. Length of words in solution: 5,7.
Correct answers: 63
The first user who solved this task is Sanja Šabović.
#brainteasers #wordpuzzles
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Ultrasonic alarm

In 1953, the first U.S. patent for a burglar alarm operated by ultrasonic sound was issued to Samuel Bagno of New York City (No. 2,655,645) on a system for movement detection in a confined space by intruders or fire. It was manufactured as the Alertronic and first sold in Jun 1950. A sound source produced waves of 19,000 hertz, a frequency too high for normal human hearing. An intruder could be detected by the alarm by a difference in frequency of the reflected waves from the moving body (the Doppler effect). The device would then sound an alarm.
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