Excellent site!
If you go to the catalog pages, there are pictures and ads some with specifications for machines some consumer and professional back to the earliest days. And if you go to the earlier ones, you can see the transition from disc recording through wire to tape.
Ki, although I have owned a couple of Dokorder machines in my life I have never owned the one that dubbed tapes. I have an 1140 now which is the 4 channel 10.5" reel 15ips "project studio" multitrack.
I also have one of the only other machines that allowed internal tape to tape duplication - the Bell RT-360, which is also pictured on the Phantom R2R Texas site.