41 cm/45 3rd Year Type naval gun
... that obsolete Type 88 shells from the 41 cm/45 3rd Year Type naval gun were modified to create the Type 99 armor-piercing bomb used during the attack on Pearl Harbor?
... that obsolete Type 88 shells from the <b id="mwAec"><a href="./41_cm/45_3rd_Year_Type_naval_gun" id="mwAeg" rel="mw:WikiLink" title="41 cm/45 3rd Year Type naval gun">41 cm/45 3rd Year Type naval gun</a></b> were modified to create the Type 99 <a class="mw-redirect" href="./Armor-piercing_bomb" id="mwAek" rel="mw:WikiLink" title="Armor-piercing bomb">armor-piercing bomb</a> used during the <a href="./Attack_on_Pearl_Harbor" id="mwAeo" rel="mw:WikiLink" title="Attack on Pearl Harbor">attack on Pearl Harbor</a>?