On Wed, 9 Mar 2016 15:36:27 -0600, Mark Lloyd
wrote:

This is probably what they mean
http://tinyurl.com/jbqkpnh

It is a NEMA 5-15p and 6-15p on the same yoke

What I saw in an old apartment probably looked like that, except for no
ground holes.

How would that be wired?


I would bring a 14/3 romex into the box. The 120 would get a black and
white, the 240 a red and black.
I believe in that receptacle the black side screws are tied common.