On Tue, 19 Jan 2010, cullen wrote:

Looking for information on Dow-Key DKC-TR tube type TR switch. I have
one without documentation. I found the box it came in, no
instructions.
regards, cullen K5HAL

What do you want to know? Any old Handbook is likely to have a circuit
that can't be too different from a commercial product (they all have to
be about the same) and describe how to hook them up.

If you're looking for historical information about the specific device,
then I don't know. What's so puzzling about the unit that you need to
know?

Michael VE2BVW