Power plugs and cables for the IBM 3420

[Curious Marc]

Can any of you identify which power plugs models these are. They are on my IBM 3420 tapes and connect to the IBM 3803 controller, 3 phase:

https://www.dropbox.com/s/ftfpg0owdvb173u/IMG_5066.JPG?dl=0

https://www.dropbox.com/s/uyzpwcp6sjkvrpf/IMG_5067.JPG?dl=0

These are for the large vacuum column tapes seen in this video here:

https://youtu.be/yaPVkw8dnaI

 

And if anyone knows where to get these power cables...

 

Marc