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== Pre-Date-System == | == Pre-Date-System == | ||
This period is divided into four parts: Pre-1918, 1919 (Jan up to mid-May), 1919 Post end-May and early-20s. | This period is divided into four parts: Pre-1918, 1919 (Jan up to mid-May), 1919 (Post end-May) and early-20s. | ||
== Pos-Patents == | == Pos-Patents == |