While Keptel was once a stand-alone company (I think), it is now a brand (Keptel Cable Guard, which is where we get the CG) sold by AFL Telecommunications Inc., itself a division of the fiber-optic company AFL, which while owned by Fujikura Ltd. of Japan, is based in the United States.
More importantly, the little sticker inside the TA-200 sitting here on my desk says:
Country of origin: USA
HTH.
\dmc