Yes, Sam, they are nice. When I worked for AT&T at Mt.Sinai Hospital, we had probably 300 dicms in service. We would take a 66B-50 and slide the back off and remove the pins. Then we'd populate the block with 6-across, 3-across, and 2-across pins from a 66M -50 block to make, pretty much, what these are. I guess we were ahead of our time.
One project we had was replacing, one by one, the 207C/216A wire spring relay KTU's with the Teltone packaged units.
The head installer, a telephone genius by the name of Jay Yovino, "invented" that scheme, along with another of his clever items, a 66B populated with 2-across, two blank spaces, and 2-across, creating a dense common audible diode block that took up a great deal less real estate on a backboard than the WE version. We had several closets where just the diode matrix blocks took up a 4' by 6' space. He also was instrumental in getting the company to supply power cord extensions for the 79- and 90-type modular power units, where the cords on the 620 and 640 panels were too short to do a neat installation.
