EVALUATION OF THE PROTECTIVE CHARACTERISTICS OF HELMETS IN SPORTS.
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L. M. Patrick | E S GURDJIAN | H. R. Lissner | W. G. Hardy | E. S. Gurdjian | V. Hodgson | H R LISSNER | L M PATRICK | V R HODGSON | W G HARDY
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L. M. Patrick | E S GURDJIAN | H. R. Lissner | W. G. Hardy | E. S. Gurdjian | V. Hodgson | H R LISSNER | L M PATRICK | V R HODGSON | W G HARDY