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Invented by Julian Curtiss, an A.G. Spalding executive, the No. 70 Pneumatic Head Harness utilized a rubber bladder in the crown of the harness to act as a shock absorber. It was not a popular model, as it proved to be hot and unreliable as the bladder was known to rupture after a few blows. As a result, the No. 70 was only produced for two years (1903-1904) and the vast majority of those produced were likely discarded after failure.