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A long time ago, I worked on a vaporizer design that would heat air on-the-fly prior to entering a pipe. The four leftmost objects are casting fixtures. The four little round thingies in the middle are cast ceramic shapes. The right two are fully wired to function as (12V) air heaters. The three things on the right are functional vaporizers - pipe not included. The one on the end is what I have used personally for many years.

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