They say it's a new exhibit; don't recall ever seeing it before.
"Visitors to the ARRL Laboratory can now visit our new exhibit, "The ARRL Evolution of Amateur Radio Exhibit", featuring radio apparatus from the early 1900's to the 1980's, contained in it's own long, narrow display room; formally a storage room for obsolete test equipment and parts..."
Complete story is here:
http://www.arrl.org/arrl-vintage-amateur-radio-equipment-exhibit along with the video.
If you're impatient, here is the video:
http://www.arrl.org/flash/mediaplayer.swf?file=%2Ffiles%2Ffile%2FTechnology%2FLab%2520Museum.flv