I have old Panasonic CRT TV (Sophia - Model TC-21S91N). I wanted the operation manual and visited the panasonic website (www.panasonic.co.in) and found that they don't even list Telivisions in the download manuals page (is panasonic stoped selling TVs?). I tried the international site also. I could not find this model. It is costs nothing for the company to keep the details about the product even if the product is retired. Lot of people may be still using it. I will think twice before buying any Panasonic product now.
Tale story: after some internet search, i found a manual for similar model from http://tv.manualsonline.com/manuals/mfg/panasonic/panasonic_product_list.html . This is good site for finding out old manuals.