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Although the actual inventor of the hand-held metal detector is disputed, the hand-held metal detector was made in 1925 and was first patented by Dr. Gerhard Fisher in 1931. A metal detector had been invented some forty years earlier (1881) by Alexander Graham Bell for the sole purpose of locating a lead bullet in President James A. Garfield.
Although Gerhard Fischer was the first person granted a patent for an electronic metal detector, the first to apply was Shirl Herr, a businessman from Crawfordsville, Indiana. His application for a hand-held Hidden-Metal Detector was filed in February 1924, but not patented until July 1928.
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Dr. Stephen Taylor, founder and director of the Food Allergy Research and Resource program, [8] concludes on behalf of the validation study for Nima gluten, "We conclude that the portable, handheld Nima gluten sensor functions reliably detect gluten residues at appropriate levels in a range of different foods. The foods were deliberately chosen ...
Mine detectors: A portable, hand-held or worn device to detect buried IEDs. There are many different models from several different companies currently in use worldwide by U.S. and coalition forces. There are many different models from several different companies currently in use worldwide by U.S. and coalition forces.
The Hawaii State Capitol will have metal detectors installed at three entrances starting July 10, state agencies said Monday. The detectors will be in place at two street-level elevator entrances ...
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