Chandler Long Arm Mender/Darner?

[Patinthehat]

Hi Folks,
I recently had a couple of machines come into my shop I know very little about. A Chandler long arm mender with a very large table and motor also a Rex industrial blind stitch machine. I had them serviced so I cab find a buyer but who uses machines like these . Would appreciate a little advice on who best to direct my energy towards and get these machines back to work. I can post pictures if that helps...Thanks