Reader Clock, double
<UL>
<LI><b>M715A</b> needs a drawing.</LI>
<LI><b>M715E</b> needs a drawing.</LI>
<LI><b>M715F</b> is a drawing of DEC's M715F Reader Clock module.</LI>
<LI><b>M715X</b> is a 'modernized' drawing of DEC's M715F.</LI>