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Just got a duplication from National Diet Library; a 1959 study of marbles in American market. It says Japan was able to provide marbles cheaper to the American market, compared to the factories which were located in the middle of the country. Transport of 100 kg marbles costed 6 dollars per 100 kilometers from WV to Los Angels, but 50 cents for the same distance from Kobe to North America.
Too many grouped up individual pics with different views of a few will help get proper identification,
Got an Akro,master,vitro,a slag from these views ๐