1964 Summer Paralympics
... that athletes from 17 of the 21 competing NPCs won at least one medal in the 1964 Summer Paralympics?
... that athletes from 17 of the 21 competing <a class="mw-redirect" href="./National_Paralympic_Committees" id="mwDvQ" rel="mw:WikiLink" title="National Paralympic Committees">NPCs</a> won at least one medal in the <b id="mwDvU"><a href="./1964_Summer_Paralympics_medal_table" id="mwDvY" rel="mw:WikiLink" title="1964 Summer Paralympics medal table">1964 Summer Paralympics</a></b>?