Hirtz compass
... that the Hirtz compass, a medical device invented in 1907 that was used to locate bullets and shrapnel in patients, usually gave results precise within 1–2 millimeters?
... that the <b id="mwEJY"><a href="./Hirtz_compass" id="mwEJc" rel="mw:WikiLink" title="Hirtz compass">Hirtz compass</a></b>, a medical device invented in 1907 that was used to locate bullets and shrapnel in patients, usually gave results precise within 1–2 millimeters?