National rice cookers are one popular brand available for cooking rice. National is a Japanese brand and is widely used in asian countries like India. There are several models available from National.
National was a brand used by Panasonic in the past. National brand is pretty popular in asian countries. Even today lot of people in India use National rice cookers widely. National brand is never popular in USA. In USA it was always Panasonic brand.
If you reside in USA and looking for a National rice cooker it is not so easy to find one. It is only available in some ethnic asian stores. Anyways National is nothing but Panasonic so you can go for a Panasonic rice cooker