Method and apparatus for monitoring a series of products
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United States of America Patent
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Apr 19, 1994
Grant Date -
N/A
app pub date -
Feb 4, 1991
filing date -
Mar 30, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Monitoring a series of products of the kind in which the presence of foreign bodies in the product being monitored is detected by the characteristic magnetic field phase difference each material exhibits. The signal generated by a satisfactory product having no foreign body in it is used as the datum for judging whether the next subsequent product is free from a foreign body or not.
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