"Styre's robot" is a title based upon conjecture.
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Sontaran Field Major Styre created a robot on Earth to help him keep the GalSec astronauts in line and to patrol the landscape and to capture anyone it encountered.
It used a form of grappling cables to incapacitate and capture humans. It was easily disabled by the Fourth Doctor's sonic screwdriver. (TV: The Sontaran Experiment)