You mentioned the Ham Clipper which had suit for patent infringement filed against it by Dietz in 1893, but Ham prevailed, and after R.E. Dietz died, Ham was collecting royalties on most if not all of the mainstream hot blast lanterns produced in the U.S. Dietz and Ham actually wound-up partnering on their lantern designs, and the final editions of the Ham Clipper are actually related to the Monarch. BB
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