I found this bit of information at this location: http://aikidojournal.com/encyclopedi...t=Submit+Query
It gives this brief paragraph on Tanaka Bansen-----
(21 March 1912-December 1988). Also Isaburo. 9th dan Aikikai. B. Osaka. First taught by Morihei UESHIBA in Osaka in 1936. After the war, Tanaka spent one month in IWAMA in 1951 during which time his private dojo was built in Osaka. This dojo was officially opened in 1952. Morihei Ueshiba spent several months at the Osaka Aikikai dojo at that time. Author of a privately published book entitled Aikido Shinzui (Essence of Aikido, see bibl. ) and chief instructor of the Osaka Aikikai Dojo until his death. Interviewed AN#68. See Pictorial p. 118.
Hope this helps! :-)