Punch control, double
<UL>
<LI><b>M710B</b> is a drawing of DEC's M710B.</LI>
<LI><b>M710F</b> needs a drawing.</LI>
<LI><b>M710H</b> is a drawing of DEC's M710H.</LI>
<LI><b>M710X</b> is a 'modernized' M710H.</LI>