Sunday, December 17, 2017

Who invented air conditioning ?

Who invented air conditioning ?

This 1902 schematic drawing shows the likely air-conditioning system installed at Sackett & Wilhelms, a Brooklyn, New York, printing company

74LS90 IC

                                                                  The 74LS90 is a simple counter, i.e. it can count from 0 to 9 cyclically in its natural mode. It counts the input...

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