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• n  an investigator who is employed to find missing persons or missing goods
• n  an instrument used to make tracings
• n  (radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
• n  ammunition whose flight can be observed by a trail of smoke

• In the past six years, more than 800 scientists from 45 states and twelve foreign countries have taken its special course in using radioisotopes (socalled "tracer atoms").
• There are numerous obstacles: Indian mines, tracer flares, Indian border patrols anxious to shoot at them.
• He was caught through a telephone company tracer and received a suspended sentence.

• tracer bullet

News & Articles

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• Handheld GPON Tester meets needs of field personnel.
  Used for on-site GPON (Gigabit Passive Optical Network) monitoring and troubleshooting, GPON Tracer™ 380 provides real-time indications, in textual and graphical formats, of downstream and upstream data rates, optical power levels for OLT and for every ONU in network, link and transmission errors, and service interruptions. Features include touchscreen interface and built-in mechanism for ...
  June 20, 2013 - ThomasNet
• Suspects in theft of Pioneer Woman statue
  Independence Police believe these to be persons of interest in the theft of the statue from the Frontier Trails Museum reported on June 17, 2013. The vehicle in which they left is possibly a Mercury Tracer Wagon.
  June 19, 2013 - The Examiner
• Airbourne, Black Spiders and Tracer Added To Hard Rock Hell
  Airbourne, Black Spiders and Tracer are among the bands added to the bill for Hard Rock Hell 7
  June 17, 2013 - antiMUSIC