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Heldring
Ridea cranks are supposed to be used by japan track team sprint.
http://jcf.or.jp/wp2012/wp-content/uploads/2014/05/TS_ME_F.jpg
http://jcf.or.jp/wp2012/wp-content/uploads/2014/08/4541.jpg
http://jcf.or.jp/wp2012/wp-content/uploads/2014/05/SP_ME4_1NITTA.jpg
http://jcf.or.jp/wp2012/wp-content/uploads/2014/05/SP_ME8_NITTA.jpg
But not 100% sure as pics are really small.