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Found the remains of some old Canadian Porcelain suspensions on a line only a couple blocks from their factory site in Hamilton ON. They're the usual CP glazes but are marked with (what I'd imagine is wax resist) simply CI. Now, could these have been produced just before the name change from Canadian Insulators to Canadian Porcelain, or perhaps a marking for a test group? Has any body seen or found any others?

Here's a pic: