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Was Grade 1 to 4 Titanium used in shipbuilding in the late 1960's?

I have a friend who worked in the Lockheed shipyards who confessed to being the skyjacker, D B Cooper. Traces of pure titanium have been found on the tie that was left on the plane

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Grade 1 to 4 of Titanium was not used in shipbuilding in the late 1960's. During this era, the ships were built using grade A and grade B of steel, which was stronger as compared to other materials and it was also able to withstand different weather conditions.

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I found an article stating that titanium was used in the late 1960's at Lockheed shipyards in Seattle where my friend worked at the time. It just did not specifically state it was pure titanium. It was used in pipes and propellers.
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he didn't work ad a ship builder,he worked on airplanes and very little titanium was used on commercial airplanes

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