Numbering system for the hammerhead.
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R Cedergren | S Uesugi | O. Uhlenbeck | A. Pardi | R. Cedergren | E. Ohtsuka | M. Koizumi | S. Uesugi | A Pardi | M Koizumi | E Ohtsuka | O C Uhlenbeck | K J Hertel | F Eckstein | W L Gerlach | R Hodgson | K. Hertel | F. Eckstein | W. Gerlach | R. Hodgson | Arthur Pardi | Eiko Ohtsuka | Seiichi Uesugi | Fritz Eckstein | R. H. Symons