Yes, it's Gerard's "Luger Producers" But I don't remember such a chart. A couple of charts show up in the montage about the eBook on YouTube; the second one is about proof marks, first one is too small and fuzzy to decipher. Better buy the eBook!
I vaguely recall something like that, Rich, one of those horizontally long charts with bars for the different mfgrs, applied to a timeline. I think it was in the background in a pic, probably on this forum, of a museum/huge collection setting. Maybe someone remembers more.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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