Calculate 12+9
[3180] Calculate 12+9 - IF 8 + 2 = 16106 and 13 + 6 = 78197 THEN 12 + 9 = ? - #brainteasers #math #riddles - Correct Answers: 139 - The first user who solved this task is Allen Wager
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Calculate 12+9

IF 8 + 2 = 16106 and 13 + 6 = 78197 THEN 12 + 9 = ?
Correct answers: 139
The first user who solved this task is Allen Wager.
#brainteasers #math #riddles
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Hookless fastener

In 1896, the first U.S. patent for a hookless fastener based on a slider was issued to Whitcomb L. Judsen of Chicago Illinois (No. 557,207). It was designed for fastening shoes, whereby two metal chains were fastened together by the movement of a slider. He held a previous patent (No. 504,038 issued 29 Aug 1893) for a hookless fastening design for shoes, which used a clasp locker and unlocker.*
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