SODAPOPBOB
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I went back to the Makers Marks website(s) and found this ... [ul][*]I.P.G.CO - Illinois Pacific Glass Company, San Francisco, California (1902-c.1925). Plant locations also at Los Angeles, and later, Oakland, CA, Seattle, WA & Portland, OR.[*]IPGCO in a diamond - Illinois Pacific Glass Company, San Francisco, California (see above entry). [*]IPG in a triangle - Illinois Pacific Glass Corporation, San Francisco, California (c.1925-1930 or 1932). (Name change of company above.) Glass plant locations at Los Angeles; Oakland, CA; Seattle, WA; & Portland, OR. Usually has a tiny triangle inside the larger triangle, squeezed in above the letters. This mark might have been used earlier than 1925.[/ul] ~ * ~ Which tells me (I think) that Illinois Glass bought the San Francisco & Pacific Glass Works in 1902 but they didn't buy the Pacific Coast Glass Works/Company, which, apparently, was a completely unrelated glass operation.