Assertion: artillery's gun | /r/ObjectUse | used with simple sights
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Source sentences:
text: By World War II the situation was largely as follows: for targets up to a few thousand yards away, a smaller-calibre automatic gun was used, with simple sights that enabled a layer to judge the lead based on estimates of target range and speed; for longer-range targets, manually controlled predictors were used to track the target, taking inputs from optical or radar rangefinders, and calculating firing data for the guns, including allowance for wind and temperature.