Where's the "T" or "P"?

[J&E <ebk@buffnet.net>]

Hi List!
        I own a TR4/A & I'd like to know where I would look on the filterhead
to find out if I own a "Pulator" or a "Techline" cartage filter. I
recall one person stating to look inside the filterhead when changing
the cartage to see a "P" or a "T". I've looked, but I can't find it.
sorry to rehash an old thread from about 2-> years ago. 
-Cosmo Kramer