WWII Phase: Difference between revisions

No date code or any other nomeclature, like the inner tube, for example. According to the available historiography, the 1341418/20 patent begins to appear in 1920, almost always followed by another patent, as an example: PATENT MARCH.9.15 1341418/20. In rare cases he appeared alone. We recently had access to a pipe from this period (unsmoked!), perfectly aligned with the Loring's hypothesis.