George, in answer to your question regarding the duration of the use of "Titanic Steel" barrels - Parker Bros. and subsequently, Remington, continued to use that terminology until sometime in the 1930's when Remington chose not to mark the top rib at all... to the best of my knowledge. However, Remington continued to use up any remaining Parker parts stock right to the end and I would imagine if they had ribs marked with a specific barrel steel, if it applied to the grade, they would use it.
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