Design
Early Designs
Dr. William R. Bertelsen (May 20, 1920 – July 16, 2009) was an American inventor who pioneered in the field of air-cushion vehicles (hovercrafts), and
01 Sep, 2022
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Dr. William R. Bertelsen (May 20, 1920 – July 16, 2009) was an American inventor who pioneered in the field of air-cushion vehicles (hovercrafts), and