Greenleaf Whittier Pickard
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Greenleaf Whittier Pickard (February 14, 1877, Portland, Maine - January 8, 1956, Newton, Massachusetts) was a United States radio pioneer.
Pickard was a researcher in the early days of wireless. He experimented with contact detectors, used in crystal radio receivers. In 1906 he patented a silicon crystal detector.
Picard's detector was revolutionary in that he found that a fine point in delicate contact with a mineral produced the best semiconductor effect.