Assertion: lewis gun | /r/HasProperty | available in substantial numbers
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text: By the time the war was in full swing, the Lewis Gun was available in substantial numbers and promptly placed into all sorts of battlefield requirements - including their fitting at observer stations (rear gunners) on tandem-seat "fighting scout" biplanes as well as large multi-engined, multi-position bombers defensed by an array of machine guns on trainable mounts.