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This is a depiction of the two tools symbolic of the traditional sheet metal worker: the soldering iron and the hand shears (or snips). From: "Growing Strength Shown by Sheet Metal Contractors" [an account of the National Association of Sheet Metal Contractors convention in Cleveland, June 1917] Metal Worker, Plumber & Steam Fitter. Vol. 87, No. 25 (June 22, 1917): 843-853. This has been digitized by Google.

Here is a PDF of the entire page: metal-worker-plumber-and-steam-fitter-v087-n25-1917-06-22-google-mich-p834-pdf38-shet-metal-worker-symbols.pdf

Here is a PDF of the entire issue: metal-worker-plumber-and-steam-fitter-v087-n25-1917-06-22-google-mich.pdf

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