Changes

Polhemus developed magnetic tracking for tracking a pilot's helmet for use with a head-up display. Polhemus received Air Force contracts.<ref name="b232"/> Polhemus faced financial difficulty, and was sold to the [[Austin Company]], a company in Cleveland, Ohio.<ref name="b232"/>

Polhemus developed magnetic tracking for tracking a pilot's helmet for use with a head-up display. Polhemus received Air Force contracts.<ref name="b232"/> Polhemus faced financial difficulty, and was sold to the [[Austin Company]], a company in Cleveland, Ohio.<ref name="b232"/>

The company was then sold to McDonnell Douglas. It was called the Polhemus Navigation Sciences division of McDonnell Douglas.<ref>https://dl.acm.org/doi/10.1145/167962.165918</ref>

The company was then sold to [[McDonnell Douglas]]. It was called the Polhemus Navigation Sciences division of McDonnell Douglas.<ref>https://dl.acm.org/doi/10.1145/167962.165918</ref>

Two employees left and founded [[Ascension]].<ref name="b232"/>

Two employees left and founded [[Ascension]].<ref name="b232"/>