Letters between Edwin Link, W.G. Schalscha, Philip Ross, W.C. Blaisdell, Clifford P. Swaine, and American Engineering discussing the Sea Driver’s components. Letters between A.M. Kennedy, John G. Alden, and W.G. Schalscha describing the components of the Sea Driver II. Letters between William Bromfield and Philip L. Ross describing the equipment list for Sea Diver II. Letters between Philip Ross and Anthony Staudt describing the equipment for Sea Driver II.