The DIVAIR Model B 1955.  Ed Fisher,now 86 years old did a 24 hour Endurance dive at French reef off Key Largo,Florida 21-22 August 1954 he used Divair regulators as a promotional stunt, at the time his dive made Time magazine and most major newspapers, the regulator went unnoticed, photos of the dive can be found in Jerry Greenberg's book Manfish.  This Divair was brought back to life and dived by Museum staff along with a Model C 1956.  Divairs were not known for quality and resurrection was a challenge.  Click here for action pics!