All materials are: (C) 2015 Key Model Imports (used for reference only) Research material for the Full diaphragms used through 1945-1946 we finally abandoned. Cost versus operation and appearance.
Early preliminary G.O.D. Of the soft portion of the mechanism.
Construction methodology research using Fred Hill's "Trojan" diaphragm in HO scale.
We did manage to complete some good drawings and plans.
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