Google "A History of the Quartz Crystal Industry in the USA" from IEEE for another in-depth read on the subject.&nbsp;<div><br></div><div>73 de&nbsp;</div><div>Gene Smar AD3F&nbsp;<br><br><div id="ymail_android_signature">Sent from my Radio Shack TRS-80 model 100 laptop</div> <br> <blockquote style="margin: 0 0 20px 0;"> <div style="font-family:Roboto, sans-serif; color:#6D00F6;"> <div>On Sat, Oct 25, 2025 at 11:42 PM, Dave Merrill</div><div>&lt;r390a.urr@gmail.com&gt; wrote:</div> </div> <div style="padding: 10px 0 0 20px; margin: 10px 0 0 0; border-left: 1px solid #6D00F6;"> ______________________________________________________________<br clear="none">Milsurplus mailing list<br clear="none">Home: <a shape="rect" href="http://mailman.qth.net/mailman/listinfo/milsurplus" target="_blank">http://mailman.qth.net/mailman/listinfo/milsurplus</a><br clear="none">Help: <a shape="rect" href="http://mailman.qth.net/mmfaq.htm" target="_blank">http://mailman.qth.net/mmfaq.htm</a><br clear="none">Post: mailto:Milsurplus@mailman.qth.net<br clear="none"><br clear="none">This list hosted by: <a shape="rect" href="http://www.qsl.net" target="_blank">http://www.qsl.net</a><br clear="none">Please help support this email list: <a shape="rect" href="http://www.qsl.net/donate.html" target="_blank">http://www.qsl.net/donate.html</a> </div> </blockquote></div>