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3 items tagged "9v batteries"

Related tags: hacks [+], hackaday [+], flashlight [+], titanium [+], swappable [+], project [+], potus [+], path [+], odd project [+], occasion [+], need [+], links [+], led [+], laser cutter [+], david prutchi [+], chemistry [+], anodizing [+], aluminum pipe [+]