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Potential Sources edit
- https://www.gasenginemagazine.com/gas-engines/hot-tube-ignition-zmgz14amzbea
- https://www.hemmings.com/magazine/hmn/2010/10/Hot-Tube-Ignition/3691061.html — Preceding unsigned comment added by NoCOBOL (talk • contribs) 07:21, 29 January 2019 (UTC)