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A crystal set was an early Radio or cats whisker receiver simple but popular.
Alexander Whisker died in 1907.
Alexander Whisker was born in 1819.
Whisker(animal)-Poil de Moustache
Whisker(beard)-Barbe
Whisker(Moustache)-Moustache
a whisker has to be slang for a male's anatomy that is unshaven, unkempt.