Speed Mask for Swimmers

From what I can gather, Calvin Gongwer is legendary for his inventions in the world of ocean swimming. But his speed mask doesn't seem to have gained a following.

(left) Popular Mechanics - Dec 1968; (right) Ottawa Citizen - July 25, 1968

Patent No. 3,653,086

     Posted By: Alex - Mon Nov 13, 2023
     Category: Swimming, Snorkeling, and Diving | Patents

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