AVID makes the readers and does the marketing and support:

American Veterinary Identification Devices

3179 Hammer Ave.
Norco, CA 91760-9972

http://www.kah.com/avid.html

I believe that they purchase the implants from somone else.

cheers,

Phil

Philip Starbuck
(909) 792-7917

"There are three principal ways to lose money.  Wine, women, and engineers.  Whi
le the first two are more pleasant the third is by far the more certain."
                                                -- Baron Rothschild
                                                        ca. 1860