16-inch artillery piece
... that in 1915 the US finished a 16-inch artillery piece that weighed 284,000 pounds (129,000 kg) and that could shoot a 2,400-pound (1,100 kg) shell 21 miles (34 km)?
... that in 1915 the US finished a <b id="mwB7Y"><a href="./16-inch_gun_M1895" id="mwB7c" rel="mw:WikiLink" title="16-inch gun M1895">16-inch artillery piece</a></b> that weighed 284,000 pounds (129,000 kg) and that could shoot a 2,400-pound (1,100 kg) shell 21 miles (34 km)?