Air bladders have been used in a number of applications since the invention of synthetc rubber in the 1940's. Most of the applications include bumpers for ships when they dock, as cushions for various industrial applications where a soft impact is required, and as substitutes for springs in cars (early Mercedes 600 models had air cushions/bladders)
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its when the fish come out of the water for more than three times and then they have a air ball in thier scalp