Relevant to cylinders and backpacks although not to diving. Does anyone out there in any country know of availability of a pair of oxy-gas cylinders for running a blowtorch off, which can be worn on the back like scuba cylinders while the blowtorch is being used? Many years ago in a display of fireman's equipment in Manchester I saw an oxyhydrogen blowtorch run off backpack gas cylinders; but I have seen nothing more of such things.
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