What is the four-digit numbe...
[3420] What is the four-digit numbe... - What is the four-digit number in which the first digit is one third the second, the third is the sum of the first and second, and the last is three times the second? - #brainteasers #math #riddles - Correct Answers: 62 - The first user who solved this task is Rutu Raj
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What is the four-digit numbe...

What is the four-digit number in which the first digit is one third the second, the third is the sum of the first and second, and the last is three times the second?
Correct answers: 62
The first user who solved this task is Rutu Raj.
#brainteasers #math #riddles
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Envelope machine patent

In 1849, the first U.S. patent for an envelope-making machine was issued to Jesse K. Park and Cornelius S. Watson of New York City (No. 6055). It was never used commercially, as it was shortly superceded by patents on improved machines by other inventors. It was treadle-operated and its mechanism included a stamper rod, gumming apparatus and folding apparatus. The patent model still exists in the collection of the National Postal Museum.«
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