Teletype Receiver, double
<UL>
<LI><b>M706D</b> needs a drawing.</LI>
<LI><b>M706K</b> is a drawing of DEC's M706K.</LI>
<LI><b>M706O</b> needs a drawing.</LI>
<LI><b>M706X</b> is a 'modernized' version of DEC's M706K.</LI>