<div dir="ltr"><div class="gmail_default" style><font color="#000000" face="tahoma, sans-serif">This 40-minute documentary is a detailed look at how the Signal Corp. processed raw quartz into radio crystals during WWII.</font></div><div class="gmail_default" style><font color="#000000" face="tahoma, sans-serif"><br></font></div><div class="gmail_default" style><font color="#000000" face="tahoma, sans-serif">Crystals Go to War 1943 Reeves Sound Laboratories; Piezoelectric Quartz Crystals for Radio</font><br clear="all"></div><div class="gmail_default" style><font color="#000000" face="tahoma, sans-serif"><a href="https://www.youtube.com/watch?v=b--FKHCFjOM&feature=player_embedded">https://www.youtube.com/watch?v=b--FKHCFjOM&feature=player_embedded</a></font><br></div><div class="gmail_default" style><font color="#000000" face="tahoma, sans-serif"><br></font></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;color:rgb(0,0,0)"><br></div><div><div class="gmail_signature"><div dir="ltr"><font face="courier new, monospace" color="#0000ff"><b>73 Karl W4KRL</b></font></div></div></div>
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