Shpitalny Sh-37
... that only 240 Soviet Shpitalny Sh-37 aircraft cannons were produced?
... that only 240 <a class="mw-redirect" href="./Soviet" id="mwDBE" rel="mw:WikiLink" title="Soviet">Soviet</a> <b id="mwDBI"><a href="./Shpitalny_Sh-37" id="mwDBM" rel="mw:WikiLink" title="Shpitalny Sh-37">Shpitalny Sh-37</a></b> aircraft cannons were produced?