could you make a pic of the opened device, perhaps you can see a manufacter anywhere.
Here you go!
I did actually figure out one of the markings to be "DVE" in a triangle... (Thanks to finding one on ECN!) & what might be "OVE" in an oval, & the number "K25861" after some paint thinner!
Thanks for all the info guys!
PS... This was in a garage I was working on in Cerritos, CA... The homeowner said it was there when he'd bought the house & he did'nt have a clue what it was for... I told him if I could have it, I'd take it out for free..