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The PX-15 Ben Franklin    Erwin Aebersold, engineer in submarines

and its designer and engineer
            Erwin Aebersold, engineer in submarines       Erwin Aebersold (clic on the name)

click on following link to see the film : Disappearance of the PX-15
"The PX-15 Ben Franklin... and its engineer Erwin Aebersold"...