3M EMT EPROM programmer?

I went scrounging to day and found something that I don't recognize. It looks like it might be an EPROM programmer. Can anyone id this device? It's in a grey plastic box that looks like a tool box. The box measures about 11" x 6" x 5". Inside is a panel with elastimeric keys arranged in a 12 x 4 matrix. Above it is a ZIF socket with a MC 68766 installed. The 68766 is a 8 x 8k EPROM and is supposed to be Motorola's equivelent of the 2364. There is a built in power cord with a UK style power plug on it and a second cable that has a DB-25F connector on it. Inside the lid is a label that says "Refer to 3M EMY 9140 Field Service Handbook, Section 3, Subsection D, paragraph 1.0, for operating instructions. I searched the net for 3M EMT 9140 and similar strings but didn't find anything. Anyone know what this might be for? Joe